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Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Robert Johnson
This message is for Brian regarding your new Sensenich 74" Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't pull the full 2700 RPM on a static run-up, more like 2500, but it climbs like a rocket, and just the other day, with a passenger on board and 3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle, fight to stop from climbing, and watch the airspeed indicator creep past 160 mph, while approaching 2700 rpm. From what you described with your performance, it does not sound like a 58" pitch. Have you checked the markings on the hub ??

Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Brian & Pat Cross
Hi Robert

Thanks very much for your info. I am going way over the engine red-line assuming my tach is correct. I am going to get my tach checked somewhere. Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000 feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I contacted the fine folks at Purple Hill Air who just painted the aircraft & installed the prop for & they stated that no information of any kind came with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the hub. Is this on the front or back? I have not seen the hub as it is covered by the great looking Sensenich spinner. Getting their spinner, by the way, turned out really well. No cutting required, and the spinner is all predrilled, with nut plates, and the best part is that the material is heat treated. I would also not be inclined to use the Murphy spinner. Had some trouble with the forward flange although the rear flange with a doubler & the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked your airspeed with GPS etc? As I mentioned earlier, I am now back at the speed of Rebel equipped with the Rotax 912. Although the 912 is a very fine engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't pull the full 2700 RPM on a static run-up, more like 2500, but it climbs like a rocket, and just the other day, with a passenger on board and 3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle, fight to stop from climbing, and watch the airspeed indicator creep past 160 mph, while approaching 2700 rpm. From what you described with your performance, it does not sound like a 58" pitch. Have you checked the markings on the hub ??

Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Mike Kimball
Poor man's way to check the tach: Put a little piece of duct tape on the back of a prop blade, wait for the sun to do down, then position the airplane with one of the airport flood lights behind the plane. In the USA we have 60 cycles per second AC power (plus or minus no more than ~2% usually). The light will flicker at that rate even if you can't see it. (I don't know if Canada might be 50 Hz.) Set the rpm at factors of the power cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the prop with the tape on it should appear to stop. If it stops at something other than 1800 rpm, that is how far off your tach is. If it stops at 1700 rpm, it is reading 100 rpm low. (You need the tape because most props are painted black on the back and would be harder to see.) The prop should appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as 1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line assuming my tach is correct. I am going to get my tach checked somewhere. Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000 feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I contacted the fine folks at Purple Hill Air who just painted the aircraft & installed the prop for & they stated that no information of any kind came with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the hub. Is this on the front or back? I have not seen the hub as it is covered by the great looking Sensenich spinner. Getting their spinner, by the way, turned out really well. No cutting required, and the spinner is all predrilled, with nut plates, and the best part is that the material is heat treated. I would also not be inclined to use the Murphy spinner. Had some trouble with the forward flange although the rear flange with a doubler & the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked your airspeed with GPS etc? As I mentioned earlier, I am now back at the speed of Rebel equipped with the Rotax 912. Although the 912 is a very fine engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't pull the full 2700 RPM on a static run-up, more like 2500, but it climbs like a rocket, and just the other day, with a passenger on board and 3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle, fight to stop from climbing, and watch the airspeed indicator creep past 160 mph, while approaching 2700 rpm. From what you described with your performance, it does not sound like a 58" pitch. Have you checked the markings on the hub ??

Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Legeorgen
Brian,

The prop markings for pitch, length, etc., were etched into the hub of my Sensenich prop. You can't miss them. I don't remember if it was front or back.

Bruce G 357R

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Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Brian & Pat Cross
Hi MIke

That is quite a thought re: RPM testing. We do indeed have the same frequency here. Though I believe the frequency spec. is much much tighter than 2%. I used to balance large fans using strobe equipment etc. to measure phase angles of the out of balance fans etc. Same principal. I could give that a try. I guess I better not try that inside with my hangar door shut if I can't wait for nightfall! (Just kidding).

Thanks for your thoughts.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Mike Kimball
Sent: Friday, March 29, 2002 10:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Poor man's way to check the tach: Put a little piece of duct tape on the back of a prop blade, wait for the sun to do down, then position the airplane with one of the airport flood lights behind the plane. In the USA we have 60 cycles per second AC power (plus or minus no more than ~2% usually). The light will flicker at that rate even if you can't see it. (I don't know if Canada might be 50 Hz.) Set the rpm at factors of the power cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the prop with the tape on it should appear to stop. If it stops at something other than 1800 rpm, that is how far off your tach is. If it stops at 1700 rpm, it is reading 100 rpm low. (You need the tape because most props are painted black on the back and would be harder to see.) The prop should appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as 1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line assuming my tach is correct. I am going to get my tach checked somewhere. Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000 feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I contacted the fine folks at Purple Hill Air who just painted the aircraft & installed the prop for & they stated that no information of any kind came with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the hub. Is this on the front or back? I have not seen the hub as it is covered by the great looking Sensenich spinner. Getting their spinner, by the way, turned out really well. No cutting required, and the spinner is all predrilled, with nut plates, and the best part is that the material is heat treated. I would also not be inclined to use the Murphy spinner. Had some trouble with the forward flange although the rear flange with a doubler & the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked your airspeed with GPS etc? As I mentioned earlier, I am now back at the speed of Rebel equipped with the Rotax 912. Although the 912 is a very fine engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't pull the full 2700 RPM on a static run-up, more like 2500, but it climbs like a rocket, and just the other day, with a passenger on board and 3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle, fight to stop from climbing, and watch the airspeed indicator creep past 160 mph, while approaching 2700 rpm. From what you described with your performance, it does not sound like a 58" pitch. Have you checked the markings on the hub ??

Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Bob Patterson
Hi Brian !

Sounds like you've checked everything out and the prop
IS what it's supposed to be ..... tach error is only remaining
possibility. There's likely somebody in the chapter who has
an optical tach. If you can get up earlier tomorrow night,
before the RAA meeting, we can try to catch somebody ...

Per might have one ... and he's usually there.

We'll be there by about 7 anyway, as Anna is doing the
coffee & donuts for the meetings. Call us earlier, if you want.
Would like to see the bird and talk to you anyway.

.....bobp

---------------------------------orig.----------------------------
At 05:21 PM 3/31/02 -0500, you wrote:
Hi MIke

That is quite a thought re: RPM testing. We do indeed have the same
frequency here. Though I believe the frequency spec. is much much tighter
than 2%. I used to balance large fans using strobe equipment etc. to
measure phase angles of the out of balance fans etc. Same principal. I
could give that a try. I guess I better not try that inside with my hangar
door shut if I can't wait for nightfall! (Just kidding).

Thanks for your thoughts.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Mike Kimball
Sent: Friday, March 29, 2002 10:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Poor man's way to check the tach: Put a little piece of duct tape on the
back of a prop blade, wait for the sun to do down, then position the
airplane with one of the airport flood lights behind the plane. In the USA
we have 60 cycles per second AC power (plus or minus no more than ~2%
usually). The light will flicker at that rate even if you can't see it. (I
don't know if Canada might be 50 Hz.) Set the rpm at factors of the power
cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the
prop with the tape on it should appear to stop. If it stops at something
other than 1800 rpm, that is how far off your tach is. If it stops at 1700
rpm, it is reading 100 rpm low. (You need the tape because most props are
painted black on the back and would be harder to see.) The prop should
appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as
1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line
assuming my tach is correct. I am going to get my tach checked somewhere.
Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000
feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I
contacted the fine folks at Purple Hill Air who just painted the aircraft &
installed the prop for & they stated that no information of any kind came
with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the
hub. Is this on the front or back? I have not seen the hub as it is
covered by the great looking Sensenich spinner. Getting their spinner, by
the way, turned out really well. No cutting required, and the spinner is
all predrilled, with nut plates, and the best part is that the material is
heat treated. I would also not be inclined to use the Murphy spinner. Had
some trouble with the forward flange although the rear flange with a doubler
& the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked
your airspeed with GPS etc? As I mentioned earlier, I am now back at the
speed of Rebel equipped with the Rotax 912. Although the 912 is a very fine
engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58"
pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't
pull the full 2700 RPM on a static run-up, more like 2500, but it climbs
like a rocket, and just the other day, with a passenger on board and 3/4
fuel, I demonstrated to him, in level flight, fire wall the throttle, fight
to stop from climbing, and watch the airspeed indicator creep past 160 mph,
while approaching 2700 rpm. From what you described with your performance,
it does not sound like a 58" pitch. Have you checked the markings on the hub
??
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2600.0" name=GENERATOR>
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<BODY bgColor=#ffffff>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff size=2>Hi
MIke</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff size=2>That
is quite a thought re: RPM testing.&nbsp; We do indeed have the same frequency
here.&nbsp; Though I believe the frequency spec. is much much tighter than
2%.&nbsp; I used to balance large fans using strobe equipment etc. to measure
phase angles of the out of balance fans etc.&nbsp; Same principal.&nbsp; I
could
give that a try.&nbsp; I guess I better not try that inside with my hangar
door
shut if I can't wait for nightfall!&nbsp; (Just kidding).</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Thanks
for your thoughts.</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Brian
#328R</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of </B>Mike
Kimball<BR><B>Sent:</B> Friday, March 29, 2002 10:21 PM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> RE: Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>Poor
man's way to check the tach:&nbsp; Put a little piece of duct tape on the
back
of a prop blade, wait for the sun to do down, then position the airplane
with
one of the airport flood lights behind the plane.&nbsp; In the USA we
have 60
cycles per second AC power (plus or minus no more than ~2%
usually).&nbsp; The
light will flicker at that rate even if you can't see it.&nbsp; (I don't
know
if Canada might be 50 Hz.)&nbsp; Set the rpm at factors of the power cycle
rate.&nbsp; For instance, set 1800 rpm for 60 Hz power.&nbsp; At 1800 rpm
the
prop with the tape on it should appear to stop.&nbsp; If it stops at
something
other than 1800 rpm, that is how far off your tach is.&nbsp; If it stops at
1700 rpm, it is reading 100 rpm&nbsp;low.&nbsp; (You need the tape because
most props are painted black on the back and would be harder to see.)&nbsp;
The prop should appear to stop at all factors of 60, such as 1200 and
2400 rpm
as well as 1800 rpm.</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>Mike
Kimball</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>SR#044</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV class=OutlookMessageHeader><FONT face="Times New Roman"
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of</B> Brian & Pat
Cross<BR><B>Sent:</B> Thursday, March 28, 2002 4:46 PM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> RE: Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff size=2>Hi
Robert</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Thanks very much for your info.&nbsp; I am going way over the engine
red-line assuming my tach is correct.&nbsp; I am going to get my tach
checked
somewhere.&nbsp; Static rpm is at least 2500 rpm.&nbsp; I can go over
2700 rpm
at 12,000 feet...something Sensenich thought would never happen.&nbsp;
</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff size=2>I
will pull the prop assembly apart this weekend & check for
markings.&nbsp;
I contacted the fine folks at Purple Hill Air who just painted the aircraft
& installed the prop for & they stated that no information of any
kind
came with the prop save a generic prop log booklet.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Robert, you mention that the hub has the diameter & pitch
marked on
the hub.&nbsp; Is this on the front or back?&nbsp; I have not seen the
hub as
it is covered by the great looking Sensenich spinner.&nbsp; Getting their
spinner, by the way, turned out really well.&nbsp; No cutting required, and
the spinner is all predrilled, with nut plates, and the best part is that
the
material is heat treated.&nbsp; I would also not be inclined to use the
Murphy
spinner.&nbsp; Had some trouble with the forward flange although the rear
flange with a doubler & the spinner itself looks
great.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>That
sounds like one heck of speed for a Rebel.&nbsp; Have you cross checked your
airspeed with GPS etc?&nbsp; As I mentioned earlier, I am now back at the
speed of Rebel equipped with the Rotax 912.&nbsp; Although the 912 is a very
fine engine, this is not what I am looking for.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Thanks again for your help.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Brian #328R</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of </B>Robert
Johnson<BR><B>Sent:</B> Thursday, March 28, 2002 8:25 AM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><FONT size=2>This message is for Brian regarding your new
Sensenich 74"
Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD
160HP.
I can't pull the full 2700 RPM on a static run-up, more like 2500, but it
climbs like a rocket, and just the other day, with a passenger on board
and
3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle,
fight to stop from climbing, and watch the airspeed indicator creep
past 160
mph, while approaching 2700 rpm. From what you described with your
performance, it does not sound like a 58" pitch. Have you checked the
markings on the hub ??</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>


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Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Brian & Pat Cross
Hi Bob

I have something on tomorrow night thanks. I will try to catch up with you.
As I stated in another email, my tach is probably not dead on, but I know I
have never had the engine running so fast. It is really easy to the engine
to red line now compared to when the Warp Drive prop was installed. Do you
think that will change with the warmer weather?

Thanks again for your thoughts Bob.

Brian #328R

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Bob Patterson
Sent: Sunday, March 31, 2002 7:54 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"



Hi Brian !

Sounds like you've checked everything out and the prop
IS what it's supposed to be ..... tach error is only remaining
possibility. There's likely somebody in the chapter who has
an optical tach. If you can get up earlier tomorrow night,
before the RAA meeting, we can try to catch somebody ...

Per might have one ... and he's usually there.

We'll be there by about 7 anyway, as Anna is doing the
coffee & donuts for the meetings. Call us earlier, if you want.
Would like to see the bird and talk to you anyway.

.....bobp

---------------------------------orig.----------------------------
At 05:21 PM 3/31/02 -0500, you wrote:
Hi MIke

That is quite a thought re: RPM testing. We do indeed have the same
frequency here. Though I believe the frequency spec. is much much tighter
than 2%. I used to balance large fans using strobe equipment etc. to
measure phase angles of the out of balance fans etc. Same principal. I
could give that a try. I guess I better not try that inside with my hangar
door shut if I can't wait for nightfall! (Just kidding).

Thanks for your thoughts.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Mike Kimball
Sent: Friday, March 29, 2002 10:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Poor man's way to check the tach: Put a little piece of duct tape on the
back of a prop blade, wait for the sun to do down, then position the
airplane with one of the airport flood lights behind the plane. In the USA
we have 60 cycles per second AC power (plus or minus no more than ~2%
usually). The light will flicker at that rate even if you can't see it.
(I
don't know if Canada might be 50 Hz.) Set the rpm at factors of the power
cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the
prop with the tape on it should appear to stop. If it stops at something
other than 1800 rpm, that is how far off your tach is. If it stops at 1700
rpm, it is reading 100 rpm low. (You need the tape because most props are
painted black on the back and would be harder to see.) The prop should
appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as
1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line
assuming my tach is correct. I am going to get my tach checked somewhere.
Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000
feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I
contacted the fine folks at Purple Hill Air who just painted the aircraft &
installed the prop for & they stated that no information of any kind came
with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the
hub. Is this on the front or back? I have not seen the hub as it is
covered by the great looking Sensenich spinner. Getting their spinner, by
the way, turned out really well. No cutting required, and the spinner is
all predrilled, with nut plates, and the best part is that the material is
heat treated. I would also not be inclined to use the Murphy spinner. Had
some trouble with the forward flange although the rear flange with a
doubler
& the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked
your airspeed with GPS etc? As I mentioned earlier, I am now back at the
speed of Rebel equipped with the Rotax 912. Although the 912 is a very
fine
engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf
Of
Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58"
pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't
pull the full 2700 RPM on a static run-up, more like 2500, but it climbs
like a rocket, and just the other day, with a passenger on board and 3/4
fuel, I demonstrated to him, in level flight, fire wall the throttle, fight
to stop from climbing, and watch the airspeed indicator creep past 160 mph,
while approaching 2700 rpm. From what you described with your performance,
it does not sound like a 58" pitch. Have you checked the markings on the
hub
??
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<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Hi
MIke</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>That
is quite a thought re: RPM testing.&nbsp; We do indeed have the same
frequency
here.&nbsp; Though I believe the frequency spec. is much much tighter than
2%.&nbsp; I used to balance large fans using strobe equipment etc. to
measure
phase angles of the out of balance fans etc.&nbsp; Same principal.&nbsp; I
could
give that a try.&nbsp; I guess I better not try that inside with my hangar
door
shut if I can't wait for nightfall!&nbsp; (Just
kidding).</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Thanks
for your thoughts.</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Brian
#328R</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of </B>Mike
Kimball<BR><B>Sent:</B> Friday, March 29, 2002 10:21 PM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> RE: Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>Poor
man's way to check the tach:&nbsp; Put a little piece of duct tape on the
back
of a prop blade, wait for the sun to do down, then position the airplane
with
one of the airport flood lights behind the plane.&nbsp; In the USA we
have 60
cycles per second AC power (plus or minus no more than ~2%
usually).&nbsp; The
light will flicker at that rate even if you can't see it.&nbsp; (I don't
know
if Canada might be 50 Hz.)&nbsp; Set the rpm at factors of the power
cycle
rate.&nbsp; For instance, set 1800 rpm for 60 Hz power.&nbsp; At 1800 rpm
the
prop with the tape on it should appear to stop.&nbsp; If it stops at
something
other than 1800 rpm, that is how far off your tach is.&nbsp; If it stops
at
1700 rpm, it is reading 100 rpm&nbsp;low.&nbsp; (You need the tape
because
most props are painted black on the back and would be harder to
see.)&nbsp;
The prop should appear to stop at all factors of 60, such as 1200 and
2400 rpm
as well as 1800 rpm.</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>Mike
Kimball</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>SR#044</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV class=OutlookMessageHeader><FONT face="Times New Roman"
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of</B> Brian & Pat
Cross<BR><B>Sent:</B> Thursday, March 28, 2002 4:46 PM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> RE: Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Hi
Robert</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Thanks very much for your info.&nbsp; I am going way over the
engine
red-line assuming my tach is correct.&nbsp; I am going to get my tach
checked
somewhere.&nbsp; Static rpm is at least 2500 rpm.&nbsp; I can go over
2700 rpm
at 12,000 feet...something Sensenich thought would never happen.&nbsp;
</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>I
will pull the prop assembly apart this weekend & check for
markings.&nbsp;
I contacted the fine folks at Purple Hill Air who just painted the
aircraft
& installed the prop for & they stated that no information of any
kind
came with the prop save a generic prop log booklet.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Robert, you mention that the hub has the diameter & pitch
marked on
the hub.&nbsp; Is this on the front or back?&nbsp; I have not seen the
hub as
it is covered by the great looking Sensenich spinner.&nbsp; Getting their
spinner, by the way, turned out really well.&nbsp; No cutting required,
and
the spinner is all predrilled, with nut plates, and the best part is that
the
material is heat treated.&nbsp; I would also not be inclined to use the
Murphy
spinner.&nbsp; Had some trouble with the forward flange although the rear
flange with a doubler & the spinner itself looks
great.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>That
sounds like one heck of speed for a Rebel.&nbsp; Have you cross checked
your
airspeed with GPS etc?&nbsp; As I mentioned earlier, I am now back at the
speed of Rebel equipped with the Rotax 912.&nbsp; Although the 912 is a
very
fine engine, this is not what I am looking for.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Thanks again for your help.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Brian #328R</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of </B>Robert
Johnson<BR><B>Sent:</B> Thursday, March 28, 2002 8:25 AM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><FONT size=2>This message is for Brian regarding your new
Sensenich 74"
Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD
160HP.
I can't pull the full 2700 RPM on a static run-up, more like 2500, but
it
climbs like a rocket, and just the other day, with a passenger on board
and
3/4 fuel, I demonstrated to him, in level flight, fire wall the
throttle,
fight to stop from climbing, and watch the airspeed indicator creep
past 160
mph, while approaching 2700 rpm. From what you described with your
performance, it does not sound like a 58" pitch. Have you checked the
markings on the hub
??</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>


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Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Mike Davis
From: Walter Klatt [mailto:Walter.Klatt@shaw.ca]
Sent: Sunday, March 31, 2002 5:06 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Another way to test your RPM might be to use/borrow a cheap automotive diagnostic tester. I used to have one (sold it years ago in a garage sale) from Canadian Tire that had a pick-up sensor that attached to a plug wire, and you set the unit to 4, 6 or 8 cyl to get the right RPM reading for your engine. I don't see why this wouldn't work for a Lyc as well. The pick-up lead should be long enough that you could do it with the cowl attached. Of course, it will still be a little windy there, if you do a full throttle static run-up.

Real weird about your Sensenich problems. I was thinking of buying the same prop, but with the 56 inch pitch for best float performance.

Glad to hear that the Warp failure on Jack's plane was just the cracks, so I will still keep flying mine.

Good luck and keep us posted.
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Brian & Pat Cross
Sent: Sunday, March 31, 2002 2:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi MIke

That is quite a thought re: RPM testing. We do indeed have the same frequency here. Though I believe the frequency spec. is much much tighter than 2%. I used to balance large fans using strobe equipment etc. to measure phase angles of the out of balance fans etc. Same principal. I could give that a try. I guess I better not try that inside with my hangar door shut if I can't wait for nightfall! (Just kidding).

Thanks for your thoughts.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Mike Kimball
Sent: Friday, March 29, 2002 10:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Poor man's way to check the tach: Put a little piece of duct tape on the back of a prop blade, wait for the sun to do down, then position the airplane with one of the airport flood lights behind the plane. In the USA we have 60 cycles per second AC power (plus or minus no more than ~2% usually). The light will flicker at that rate even if you can't see it. (I don't know if Canada might be 50 Hz.) Set the rpm at factors of the power cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the prop with the tape on it should appear to stop. If it stops at something other than 1800 rpm, that is how far off your tach is. If it stops at 1700 rpm, it is reading 100 rpm low. (You need the tape because most props are painted black on the back and would be harder to see.) The prop should appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as 1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line assuming my tach is correct. I am going to get my tach checked somewhere. Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000 feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I contacted the fine folks at Purple Hill Air who just painted the aircraft & installed the prop for & they stated that no information of any kind came with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the hub. Is this on the front or back? I have not seen the hub as it is covered by the great looking Sensenich spinner. Getting their spinner, by the way, turned out really well. No cutting required, and the spinner is all predrilled, with nut plates, and the best part is that the material is heat treated. I would also not be inclined to use the Murphy spinner. Had some trouble with the forward flange although the rear flange with a doubler & the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked your airspeed with GPS etc? As I mentioned earlier, I am now back at the speed of Rebel equipped with the Rotax 912. Although the 912 is a very fine engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't pull the full 2700 RPM on a static run-up, more like 2500, but it climbs like a rocket, and just the other day, with a passenger on board and 3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle, fight to stop from climbing, and watch the airspeed indicator creep past 160 mph, while approaching 2700 rpm. From what you described with your performance, it does not sound like a 58" pitch. Have you checked the markings on the hub ??

Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Bob Patterson
Hi Brian !

I doubt the weather will make <that> much of a difference -
there definitely is something amiss, though. An interesting problem !

Will try to track down a photo-tach tonight - I'm sure
somebody in the chapter has one ...

....bobp

-------------------------------------orig.------------------------------
At 11:28 PM 3/31/02 -0500, you wrote:
Hi Bob

I have something on tomorrow night thanks. I will try to catch up with you.
As I stated in another email, my tach is probably not dead on, but I know I
have never had the engine running so fast. It is really easy to the engine
to red line now compared to when the Warp Drive prop was installed. Do you
think that will change with the warmer weather?

Thanks again for your thoughts Bob.

Brian #328R

-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Bob Patterson
Sent: Sunday, March 31, 2002 7:54 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"



Hi Brian !

Sounds like you've checked everything out and the prop
IS what it's supposed to be ..... tach error is only remaining
possibility. There's likely somebody in the chapter who has
an optical tach. If you can get up earlier tomorrow night,
before the RAA meeting, we can try to catch somebody ...

Per might have one ... and he's usually there.

We'll be there by about 7 anyway, as Anna is doing the
coffee & donuts for the meetings. Call us earlier, if you want.
Would like to see the bird and talk to you anyway.

.....bobp

---------------------------------orig.----------------------------
At 05:21 PM 3/31/02 -0500, you wrote:
Hi MIke

That is quite a thought re: RPM testing. We do indeed have the same
frequency here. Though I believe the frequency spec. is much much tighter
than 2%. I used to balance large fans using strobe equipment etc. to
measure phase angles of the out of balance fans etc. Same principal. I
could give that a try. I guess I better not try that inside with my hangar
door shut if I can't wait for nightfall! (Just kidding).

Thanks for your thoughts.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Mike Kimball
Sent: Friday, March 29, 2002 10:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Poor man's way to check the tach: Put a little piece of duct tape on the
back of a prop blade, wait for the sun to do down, then position the
airplane with one of the airport flood lights behind the plane. In the USA
we have 60 cycles per second AC power (plus or minus no more than ~2%
usually). The light will flicker at that rate even if you can't see it.
(I
don't know if Canada might be 50 Hz.) Set the rpm at factors of the power
cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the
prop with the tape on it should appear to stop. If it stops at something
other than 1800 rpm, that is how far off your tach is. If it stops at 1700
rpm, it is reading 100 rpm low. (You need the tape because most props are
painted black on the back and would be harder to see.) The prop should
appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as
1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of
Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line
assuming my tach is correct. I am going to get my tach checked somewhere.
Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000
feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I
contacted the fine folks at Purple Hill Air who just painted the aircraft &
installed the prop for & they stated that no information of any kind came
with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the
hub. Is this on the front or back? I have not seen the hub as it is
covered by the great looking Sensenich spinner. Getting their spinner, by
the way, turned out really well. No cutting required, and the spinner is
all predrilled, with nut plates, and the best part is that the material is
heat treated. I would also not be inclined to use the Murphy spinner. Had
some trouble with the forward flange although the rear flange with a
doubler
& the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked
your airspeed with GPS etc? As I mentioned earlier, I am now back at the
speed of Rebel equipped with the Rotax 912. Although the 912 is a very
fine
engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf
Of
Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58"
pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't
pull the full 2700 RPM on a static run-up, more like 2500, but it climbs
like a rocket, and just the other day, with a passenger on board and 3/4
fuel, I demonstrated to him, in level flight, fire wall the throttle, fight
to stop from climbing, and watch the airspeed indicator creep past 160 mph,
while approaching 2700 rpm. From what you described with your performance,
it does not sound like a 58" pitch. Have you checked the markings on the
hub
??
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
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<STYLE></STYLE>
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<BODY bgColor=#ffffff>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Hi
MIke</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>That
is quite a thought re: RPM testing.&nbsp; We do indeed have the same
frequency
here.&nbsp; Though I believe the frequency spec. is much much tighter than
2%.&nbsp; I used to balance large fans using strobe equipment etc. to
measure
phase angles of the out of balance fans etc.&nbsp; Same principal.&nbsp; I
could
give that a try.&nbsp; I guess I better not try that inside with my hangar
door
shut if I can't wait for nightfall!&nbsp; (Just
kidding).</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Thanks
for your thoughts.</FONT></SPAN></DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650074017-31032002><FONT face=Arial color=#0000ff
size=2>Brian
#328R</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of </B>Mike
Kimball<BR><B>Sent:</B> Friday, March 29, 2002 10:21 PM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> RE: Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>Poor
man's way to check the tach:&nbsp; Put a little piece of duct tape on the
back
of a prop blade, wait for the sun to do down, then position the airplane
with
one of the airport flood lights behind the plane.&nbsp; In the USA we
have 60
cycles per second AC power (plus or minus no more than ~2%
usually).&nbsp; The
light will flicker at that rate even if you can't see it.&nbsp; (I don't
know
if Canada might be 50 Hz.)&nbsp; Set the rpm at factors of the power
cycle
rate.&nbsp; For instance, set 1800 rpm for 60 Hz power.&nbsp; At 1800 rpm
the
prop with the tape on it should appear to stop.&nbsp; If it stops at
something
other than 1800 rpm, that is how far off your tach is.&nbsp; If it stops
at
1700 rpm, it is reading 100 rpm&nbsp;low.&nbsp; (You need the tape
because
most props are painted black on the back and would be harder to
see.)&nbsp;
The prop should appear to stop at all factors of 60, such as 1200 and
2400 rpm
as well as 1800 rpm.</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>Mike
Kimball</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2>SR#044</FONT></SPAN></DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=390400903-30032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV class=OutlookMessageHeader><FONT face="Times New Roman"
size=2>-----Original Message-----<BR><B>From:</B> murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of</B> Brian & Pat
Cross<BR><B>Sent:</B> Thursday, March 28, 2002 4:46 PM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> RE: Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Hi
Robert</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Thanks very much for your info.&nbsp; I am going way over the
engine
red-line assuming my tach is correct.&nbsp; I am going to get my tach
checked
somewhere.&nbsp; Static rpm is at least 2500 rpm.&nbsp; I can go over
2700 rpm
at 12,000 feet...something Sensenich thought would never happen.&nbsp;
</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>I
will pull the prop assembly apart this weekend & check for
markings.&nbsp;
I contacted the fine folks at Purple Hill Air who just painted the
aircraft
& installed the prop for & they stated that no information of any
kind
came with the prop save a generic prop log booklet.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Robert, you mention that the hub has the diameter & pitch
marked on
the hub.&nbsp; Is this on the front or back?&nbsp; I have not seen the
hub as
it is covered by the great looking Sensenich spinner.&nbsp; Getting their
spinner, by the way, turned out really well.&nbsp; No cutting required,
and
the spinner is all predrilled, with nut plates, and the best part is that
the
material is heat treated.&nbsp; I would also not be inclined to use the
Murphy
spinner.&nbsp; Had some trouble with the forward flange although the rear
flange with a doubler & the spinner itself looks
great.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>That
sounds like one heck of speed for a Rebel.&nbsp; Have you cross checked
your
airspeed with GPS etc?&nbsp; As I mentioned earlier, I am now back at the
speed of Rebel equipped with the Rotax 912.&nbsp; Although the 912 is a
very
fine engine, this is not what I am looking for.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Thanks again for your help.</FONT></SPAN></DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=650492101-29032002><FONT face=Arial color=#0000ff
size=2>Brian #328R</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]<B>On Behalf Of </B>Robert
Johnson<BR><B>Sent:</B> Thursday, March 28, 2002 8:25 AM<BR><B>To:</B>
murphy-rebel@dcsol.com<BR><B>Subject:</B> Sensenich prop 74 x
58"<BR><BR></FONT></DIV>
<DIV><FONT size=2>This message is for Brian regarding your new
Sensenich 74"
Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD
160HP.
I can't pull the full 2700 RPM on a static run-up, more like 2500, but
it
climbs like a rocket, and just the other day, with a passenger on board
and
3/4 fuel, I demonstrated to him, in level flight, fire wall the
throttle,
fight to stop from climbing, and watch the airspeed indicator creep
past 160
mph, while approaching 2700 rpm. From what you described with your
performance, it does not sound like a 58" pitch. Have you checked the
markings on the hub
??</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>


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Sensenich prop 74 x 58"

Posted: Fri Feb 17, 2012 10:04 pm
by Walter Klatt
Another way to test your RPM might be to use/borrow a cheap automotive diagnostic tester. I used to have one (sold it years ago in a garage sale) from Canadian Tire that had a pick-up sensor that attached to a plug wire, and you set the unit to 4, 6 or 8 cyl to get the right RPM reading for your engine. I don't see why this wouldn't work for a Lyc as well. The pick-up lead should be long enough that you could do it with the cowl attached. Of course, it will still be a little windy there, if you do a full throttle static run-up.

Real weird about your Sensenich problems. I was thinking of buying the same prop, but with the 56 inch pitch for best float performance.

Glad to hear that the Warp failure on Jack's plane was just the cracks, so I will still keep flying mine.

Good luck and keep us posted.
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Brian & Pat Cross
Sent: Sunday, March 31, 2002 2:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi MIke

That is quite a thought re: RPM testing. We do indeed have the same frequency here. Though I believe the frequency spec. is much much tighter than 2%. I used to balance large fans using strobe equipment etc. to measure phase angles of the out of balance fans etc. Same principal. I could give that a try. I guess I better not try that inside with my hangar door shut if I can't wait for nightfall! (Just kidding).

Thanks for your thoughts.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Mike Kimball
Sent: Friday, March 29, 2002 10:21 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Poor man's way to check the tach: Put a little piece of duct tape on the back of a prop blade, wait for the sun to do down, then position the airplane with one of the airport flood lights behind the plane. In the USA we have 60 cycles per second AC power (plus or minus no more than ~2% usually). The light will flicker at that rate even if you can't see it. (I don't know if Canada might be 50 Hz.) Set the rpm at factors of the power cycle rate. For instance, set 1800 rpm for 60 Hz power. At 1800 rpm the prop with the tape on it should appear to stop. If it stops at something other than 1800 rpm, that is how far off your tach is. If it stops at 1700 rpm, it is reading 100 rpm low. (You need the tape because most props are painted black on the back and would be harder to see.) The prop should appear to stop at all factors of 60, such as 1200 and 2400 rpm as well as 1800 rpm.

Mike Kimball
SR#044



-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Brian & Pat Cross
Sent: Thursday, March 28, 2002 4:46 PM
To: murphy-rebel@dcsol.com
Subject: RE: Sensenich prop 74 x 58"


Hi Robert

Thanks very much for your info. I am going way over the engine red-line assuming my tach is correct. I am going to get my tach checked somewhere. Static rpm is at least 2500 rpm. I can go over 2700 rpm at 12,000 feet...something Sensenich thought would never happen.

I will pull the prop assembly apart this weekend & check for markings. I contacted the fine folks at Purple Hill Air who just painted the aircraft & installed the prop for & they stated that no information of any kind came with the prop save a generic prop log booklet.

Robert, you mention that the hub has the diameter & pitch marked on the hub. Is this on the front or back? I have not seen the hub as it is covered by the great looking Sensenich spinner. Getting their spinner, by the way, turned out really well. No cutting required, and the spinner is all predrilled, with nut plates, and the best part is that the material is heat treated. I would also not be inclined to use the Murphy spinner. Had some trouble with the forward flange although the rear flange with a doubler & the spinner itself looks great.

That sounds like one heck of speed for a Rebel. Have you cross checked your airspeed with GPS etc? As I mentioned earlier, I am now back at the speed of Rebel equipped with the Rotax 912. Although the 912 is a very fine engine, this is not what I am looking for.

Thanks again for your help.

Brian #328R
-----Original Message-----
From: murphy-rebel@dcsol.com [mailto:murphy-rebel@dcsol.com]On Behalf Of Robert Johnson
Sent: Thursday, March 28, 2002 8:25 AM
To: murphy-rebel@dcsol.com
Subject: Sensenich prop 74 x 58"


This message is for Brian regarding your new Sensenich 74" Dia. x 58" pitch. This is what I have on Rebel "652" on my O320 H2AD 160HP. I can't pull the full 2700 RPM on a static run-up, more like 2500, but it climbs like a rocket, and just the other day, with a passenger on board and 3/4 fuel, I demonstrated to him, in level flight, fire wall the throttle, fight to stop from climbing, and watch the airspeed indicator creep past 160 mph, while approaching 2700 rpm. From what you described with your performance, it does not sound like a 58" pitch. Have you checked the markings on the hub ??