REBEL PROPS?

R. A. Hamson · Post by **R. A. Hamson** » Fri Feb 17, 2012 10:37 pm

Thanks Walter. My tailcone repair is now complete, two doublers on the skin, a
doubler on the bulkhead to replace the broken tab, the FUS-84/88 combination
and liquid metal to seat the whole works. Glad Wayne noticed the cracking when
he did as I'm certain after a winter on skis I would have had to do a major
repair. Now all we need is snow.
Merry Christmas to all.
Ron

Walter Klatt wrote:

Hey, Ron, good to hear from you. I still remember your
plane when you first got it flying out here in Langley.
Hope that Aeronca tail spring worked out for you. I put
in that bulkhead and engine mount piece on top of the
tailcone straps before I closed up the back a few years
ago, so don't expect that problem on mine.

As it happens, I saw your prop over at Julius' place
last month. He gave me a spinner construction lesson as
I watched him do yours. My spinner and prop combo is
identical to yours, except that mine is 74 X 54.

The net weight difference was 25 pounds for me. My
prop, though, might be slightly lighter than yours, as
it was just the under certified spec after its last
overhaul. However, I don't have the harmonic dampener.
I was using the fibreglass UHS spinner with my Warp.

If the weather cooperates, I plan to test fly mine on
Saturday.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of R.
A. Hamson
Sent: Wednesday, December 18, 2002 4:40 PM
To: murphy-rebel@dcsol.com
Subject: Re: REBEL PROPS?

Walter, I just got my Sensenich (74x56) and
plan to replace my Warp Drive with
it in the future. After some problems with
the Warp early on, after I added a
harmonic dampener over a year ago, I have
not had any cracks in the carbon
fiber. Will probably wait for spring to make
the change as once I get my
tailcone repair completed, hopefully this
weekend, I want to put Wayne's full
penetration wheel skis to the test. The
tailcone repair using the FUS-84/FUS-88
combination and skin doublers wasn't as easy
as I thought it would be as the
FUS-88 didn't have sufficient length for the
tailskid bolt hole so I'm having
to have a new one machined.
My amphibs are complete and I've had the
plane on them. Just the hydraulics to
hookup when the skis come off in the spring.
When I was out there in the fall I stopped
in to see Gary Wiles and he was
getting ready to start his re-build job. His
Christmas note said the job was
now underway.
Question for you, what was the net weight
change going from the Warp to the
Sensenich?

Walter Klatt wrote:

Well, I did get my new prop mounted this
weekend, but
was not able to test fly it due to the
weather. Winds
were a little on the high side, so I
passed on that.
Maybe next weekend.

I did some ground testing, though, and it
turned 2530
static. This is a little higher than I expected, so
should have great climb and take off, but
will probably
be a little slower in cruise. My Warp with
it's current
pitch setting turned 2450 static, and
would still red
line at straight and level.

It also vibrated and shook pretty good on
the ground,
but will have to wait until I'm in the air
to properly
evaluate that. My Warp was exceptionally
smooth in the
air, but can't remember if it shook like
that on the
ground, too. If it still vibrates in the
air, I will
try that 180 degree switch that has been mentioned
before. Right now it is positioned so that
on shut down
it stops with the #1 blade at 10 o'clock
when looking
from the front.

My empty C of G is now at 9.7 and was 10.7 with the
Warp, so will see if that does anything noticeable.

Again, my new prop is a 74 X 54 Sensenich
on a Rebel
amphib with an 0320 150 HP Lycoming.

Walter

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Walter Klatt · Post by **Walter Klatt** » Fri Feb 17, 2012 10:43 pm

I have pretty well completed all my testing and
comparisons now with the new Sensenich compared to my
previous Warp Drive. My previous email compared solo
numbers and this one has it fully loaded with fuel and
passenger.

Temperature was +8 C.

Static and take-off RPM was at 2500 again.

Climb at this load was 800 fpm at 80 mph and 2540 RPM.
The Warp would climb at 900 fpm with the same weight.

Cruise is still the same at 2350 and 105 mph.

Top speed at straight and level turned 2690 and 122
mph. So looks like the Warp beats the Sensenich for top
speed, too.

I have repeated all of these tests several times now,
with consistent numbers.

So, in conclusion, I would say that the Warp is
definitely a more efficient prop and beats the
Sensenich in both climb and top speed. Not by much, but
there is a noticeable difference.

BTW, the weather out here on the coast is absolutely
fabulous for this time of year with highs today of +12
C (around 55 F) and sunshine. Got a couple hours of
water flying today, and may do it again tomorrow.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Walter Klatt
Sent: Saturday, December 21, 2002 5:09 PM
To: murphy-rebel@dcsol.com
Subject: RE: REBEL PROPS?

I did my first test flight with the new prop today,
which is a 74 X 54 Sensenich on a 150 HP 0320 Rebel
amphib. I was solo, so don't have all the direct
comparisons yet to my previous Warp Drive
installation.

Temperature today was +5 C.

Static today was 2500 RPM. Last weekend when
I just did
the ground tests, it was 2530, but I can't
explain the
difference. Maybe the atmospheric conditions were
different, but that is a bigger variance than I
expected. My Warp Drive static was 2450.

Climb was 1100 fpm at this weight at 80 mph and 2540
RPM. My Warp at this weight would climb at
1200 fpm at
2600 RPM. This was a surprise. I was expecting faster
climb because of the higher static RPM, but
that wasn't
the case. Seems the Warp is able to spin higher at
climb for some reason despite the lower static.

Cruise is a little faster, though. Today I
did 105 mph
at 2350 RPM with the Sensenich, while I had to spin
2450 on the Warp to get the same speed.

Top speed is also slightly faster with the
Sensenich. I
did 125 mph today flat out straight and
level, and the
RPM just reached 2700 red line, so at least the prop
seems to be well matched to my airplane. The
Warp would
do about 122 mph at 2700, but had to back off the
throttle to keep from red lining.

Earlier in the year, I was running my Warp
Drive with a
coarser pitch where static was 2350, cruise
was 105 mph
at 2350 and top speed was 125 mph at 2650 RPM full
throttle.

I didn't notice any difference on take off, including
one on water as well.

Also, didn't notice any difference with the c of g
change. I did not have to adjust my elevator trim to
compensate for the extra 25 pounds on the nose.

There didn't seem to be any bad vibrations in flight.
It definitely felt different, including the
sound, but
I think it is basically the same as with the Warp
Drive, ie. pretty smooth.

All in all, I'm satisfied with the new prop. I was
worried it might be too fine a pitch, but that is
definitely not the case, and my cruise was
better than
expected.

I will be doing more testing with a
passenger, so will
see how it does at higher gross weights.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Walter Klatt
Sent: Wednesday, December 18, 2002 5:51 PM
To: murphy-rebel@dcsol.com
Subject: RE: REBEL PROPS?

Hey, Ron, good to hear from you. I still
remember your
plane when you first got it flying out here
in Langley.
Hope that Aeronca tail spring worked out for
you. I put
in that bulkhead and engine mount piece on
top of the
tailcone straps before I closed up the back
a few years
ago, so don't expect that problem on mine.

As it happens, I saw your prop over at
Julius' place
last month. He gave me a spinner
construction lesson as
I watched him do yours. My spinner and
prop combo is
identical to yours, except that mine is 74 X 54.

The net weight difference was 25 pounds for me. My
prop, though, might be slightly lighter than
yours, as
it was just the under certified spec after its last
overhaul. However, I don't have the harmonic
dampener.
I was using the fibreglass UHS spinner
with my Warp.
If the weather cooperates, I plan to test
fly mine on
Saturday.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of R.
A. Hamson
Sent: Wednesday, December 18, 2002 4:40 PM
To: murphy-rebel@dcsol.com
Subject: Re: REBEL PROPS?

Walter, I just got my Sensenich (74x56) and
plan to replace my Warp Drive with
it in the future. After some problems with
the Warp early on, after I added a
harmonic dampener over a year ago, I have
not had any cracks in the carbon
fiber. Will probably wait for spring to make
the change as once I get my
tailcone repair completed, hopefully this
weekend, I want to put Wayne's full
penetration wheel skis to the test. The
tailcone repair using the FUS-84/FUS-88
combination and skin doublers wasn't as easy
as I thought it would be as the
FUS-88 didn't have sufficient length for the
tailskid bolt hole so I'm having
to have a new one machined.
My amphibs are complete and I've had the
plane on them. Just the hydraulics to
hookup when the skis come off in the spring.
When I was out there in the fall I stopped
in to see Gary Wiles and he was
getting ready to start his re-build job. His
Christmas note said the job was
now underway.
Question for you, what was the net weight
change going from the Warp to the
Sensenich?

Walter Klatt wrote:
weekend, but weather. Winds passed on that. turned 2530
expected, so
will probably it's current would still red the ground, to properly smooth in the that on the air, I will
mentioned
on shut down when looking
10.7 with the
noticeable.
on a Rebel know about.
http://rebel:builder@www.dcsol.com:81/default.htm
mike.davis@dcsol.com
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scott.hibbs · Post by **scott.hibbs** » Fri Feb 17, 2012 10:43 pm

Walter, this is what is so great about a forum like this. Thanks for sharing
your findings with all the details.

Scott
Rebel300R

->
-> I have pretty well completed all my testing and
-> comparisons now with the new Sensenich compared to my
-> previous Warp Drive. My previous email compared solo
-> numbers and this one has it fully loaded with fuel and
-> passenger.
->
-> Temperature was +8 C.
->
-> Static and take-off RPM was at 2500 again.
->
-> Climb at this load was 800 fpm at 80 mph and 2540 RPM.
-> The Warp would climb at 900 fpm with the same weight.
->
-> Cruise is still the same at 2350 and 105 mph.
->
-> Top speed at straight and level turned 2690 and 122
-> mph. So looks like the Warp beats the Sensenich for top
-> speed, too.
->
-> I have repeated all of these tests several times now,
-> with consistent numbers.
->
-> So, in conclusion, I would say that the Warp is
-> definitely a more efficient prop and beats the
-> Sensenich in both climb and top speed. Not by much, but
-> there is a noticeable difference.
->
-> BTW, the weather out here on the coast is absolutely
-> fabulous for this time of year with highs today of +12
-> C (around 55 F) and sunshine. Got a couple hours of
-> water flying today, and may do it again tomorrow.
->
-> Walter

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