[rebel-builders] Flaps/Flapperons

[Walter Klatt]

What prop do you have, Andrew?

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Sunday, July 18, 2010 4:09 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights

I have the separate flap mod and I like it . I have no problems landing
short and I have the negative flap.

[jbcressman]

Andrew...I have the flaperons on my Rebel with 1800 amphibs and a Sensenich 74 x 53 on an 0-320. I'm off and
climbing in 250' at 700-900 fpm. Cruise indicated at 3000' asl at 2300 rpm trimmed up with 6 degrees negative and 7.8 gpm
is 90 kts. I'm with Bob, I love the flaperons! Bob Cressman 331R C-GRBC





---- Original Message ----
From: Walter Klatt <Walter.Klatt@shaw.ca>
To: rebel-builders@dcsol.com
Sent: Mon, Jul 19, 2010 10:41 am
Subject: RE: [rebel-builders] Flaps/Flapperons


What prop do you have, Andrew?

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Sunday, July 18, 2010 4:09 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights

I have the separate flap mod and I like it . I have no problems landing
short and I have the negative flap. My ailerons droop with the flaps. I
flew an Avid on Hamilton floats with Flapperons and didn't care for it. I
wasn't sure at the time if it was the floats or the flapperons but I didn't
like how it rolled in to a turn. It seemed you had to push it over. I have
my rebel on amphibs right now and it lands so slow I have no problems
getting stopped in 500 ft. I really like how stable the plane flys it has a
great roll rate and very easy to trim hands off. On the amphibs I can get it
off the ground in 250 ft as soon as it hits 50 it is off the ground about a
500fpm climb is standard but it is really hot right now here in Missouri
(115F). My airspeed trues out at 85 at 2450 rpm cruise flight with the
floats gear up, with the gear down 78 . I have the 0-320. I really love the
way this little plane handles she is a sweet hart. My airport is Est West so
I'm always landing with a cross wind. Like I said I'm on floats not wheels
so landing in a cross wind on a 1000ft strip is not a issue for me
I was thinking of building a Moose while I fly my Rebel. But with the lack
of parts support I'm leaning towards a Bear Hawk now.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and
holds ownership of all intellectual property for each component.

--- On Sun, 7/18/10, Bill Maxwell <wrmaxwell@bigpond.com> wrote:

From: Bill Maxwell <wrmaxwell@bigpond.com>
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights
To: rebel-builders@dcsol.com
Date: Sunday, July 18, 2010, 10:33 PM

Thanks for that input Bob. I'll certainly file that away for future
reference.

I bought the separate flaps option with my kit, I guess only because
that had been my previous experience base, whereas flapperons were
something I had never experienced. Still plenty of time in which to
switch back to flapperons though and that is where my thinking has been
tending over the past couple of years. Your comments reinforce that view.

I certainly want the "L" back in STOL down here in Tasmania


Bill

Bob Patterson wrote:

Hi Bill !

Yes - I would do the same if stuck with a flaps-only Rebel !
I've flown a few ... one builder told me his was a STO --
no "L" , (not a STOL) since he found it hard to land short ! :-)

Fortunately, there are very few of those --- and a good thing too....
you end up with half the flap and half the aileron - not good for
landing, or crosswinds ! :-( Most who try that setup switch
back to flapperons quickly - I certainly would !

I use full flapperon because the design is to change the
shape of the whole airfoil, as high performance gliders
have been doing for many years. I love the Rebel's roll rate ! :-)
2 notches of negative flapperon really helps the cruise too...
you don't get the same gain with just flaps - if you even have
negative.

One thing I often see is the dangerous practice of having
the separate flaps droop more than the factory defined
maximum of 18 degrees (same as for flapperons). Anything
more puts excessive load on the 2 flap(peron) support arms -
they might rip off !!! You can see this excess flap on some
YouTube videos of the float Rebels in Newfoundland - they are
the only ones still doing this regularly, at their own peril ...

The Elite has much sturdier flaps, AND --> THREE supports,
so can have more deflection. Still could use more aileron -
Just MHO ... ;-)

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[Andrew Burr]

I'm swinging an 82 x 42 Borer prop. 700 to 900fpm I can probably do when the temps aren't 115 F. I don't believe the 90Kts at 2300.
So far I don't think changing back to full flaperons is worth the effort.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and holds ownership of all intellectual property for each component.

--- On Mon, 7/19/10, jbcressman@aol.com <jbcressman@aol.com> wrote:

From: jbcressman@aol.com <jbcressman@aol.com>
Subject: Re: [rebel-builders] Flaps/Flapperons
To: rebel-builders@dcsol.com
Date: Monday, July 19, 2010, 2:58 PM

Andrew...I have the flaperons on my Rebel with 1800 amphibs and a Sensenich 74 x 53 on an 0-320. I'm off and
climbing in 250' at 700-900 fpm. Cruise indicated at 3000' asl at 2300 rpm trimmed up with 6 degrees negative and 7.8 gpm
is 90 kts. I'm with Bob, I love the flaperons!

[Ken]

If you can droop the ailerons when you select flap then you have the
best of both worlds. I would prefer that setup to my flaperons. As
flaperons are extended the spiraling propwash definitely tries to
deflect them and roll the airplane. Fixed flaps eliminates that. I think
Steve Sloan has the same setup but it is not a MAM option AFAIK.
DeHavilland used this very successfully on their STOL aircraft. Ailerons
automatically drooped with flap (although not as far).
Ken

Andrew Burr wrote:

I'm swinging an 82 x 42 Borer prop. 700 to 900fpm I can probably do when the temps aren't 115 F. I don't believe the 90Kts at 2300.
So far I don't think changing back to full flaperons is worth the effort.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and holds ownership of all intellectual property for each component.

--- On Mon, 7/19/10, jbcressman@aol.com <jbcressman@aol.com> wrote:

From: jbcressman@aol.com <jbcressman@aol.com>
Subject: Re: [rebel-builders] Flaps/Flapperons
To: rebel-builders@dcsol.com
Date: Monday, July 19, 2010, 2:58 PM

Andrew...I have the flaperons on my Rebel with 1800 amphibs and a Sensenich 74 x 53 on an 0-320. I'm off and
climbing in 250' at 700-900 fpm. Cruise indicated at 3000' asl at 2300 rpm trimmed up with 6 degrees negative and 7.8 gpm
is 90 kts. I'm with Bob, I love the flaperons! Bob Cressman 331R C-GRBC





---- Original Message ----
From: Walter Klatt <Walter.Klatt@shaw.ca>
To: rebel-builders@dcsol.com
Sent: Mon, Jul 19, 2010 10:41 am
Subject: RE: [rebel-builders] Flaps/Flapperons


What prop do you have, Andrew?

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Sunday, July 18, 2010 4:09 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights

I have the separate flap mod and I like it . I have no problems landing
short and I have the negative flap. My ailerons droop with the flaps. I
flew an Avid on Hamilton floats with Flapperons and didn't care for it. I
wasn't sure at the time if it was the floats or the flapperons but I didn't
like how it rolled in to a turn. It seemed you had to push it over. I have
my rebel on amphibs right now and it lands so slow I have no problems
getting stopped in 500 ft. I really like how stable the plane flys it has a
great roll rate and very easy to trim hands off. On the amphibs I can get it
off the ground in 250 ft as soon as it hits 50 it is off the ground about a
500fpm climb is standard but it is really hot right now here in Missouri
(115F). My airspeed trues out at 85 at 2450 rpm cruise flight with the
floats gear up, with the gear down 78 . I have the 0-320. I really love the
way this little plane handles she is a sweet hart. My airport is Est West so
I'm always landing with a cross wind. Like I said I'm on floats not wheels
so landing in a cross wind on a 1000ft strip is not a issue for me
I was thinking of building a Moose while I fly my Rebel. But with the lack
of parts support I'm leaning towards a Bear Hawk now.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and
holds ownership of all intellectual property for each component.

--- On Sun, 7/18/10, Bill Maxwell <wrmaxwell@bigpond.com> wrote:

From: Bill Maxwell <wrmaxwell@bigpond.com>
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights
To: rebel-builders@dcsol.com
Date: Sunday, July 18, 2010, 10:33 PM

Thanks for that input Bob. I'll certainly file that away for future
reference.

I bought the separate flaps option with my kit, I guess only because
that had been my previous experience base, whereas flapperons were
something I had never experienced. Still plenty of time in which to
switch back to flapperons though and that is where my thinking has been
tending over the past couple of years. Your comments reinforce that view.

I certainly want the "L" back in STOL down here in Tasmania


Bill

Bob Patterson wrote:

Hi Bill !

Yes - I would do the same if stuck with a flaps-only Rebel !
I've flown a few ... one builder told me his was a STO --
no "L" , (not a STOL) since he found it hard to land short ! :-)

Fortunately, there are very few of those --- and a good thing too....
you end up with half the flap and half the aileron - not good for
landing, or crosswinds ! :-( Most who try that setup switch
back to flapperons quickly - I certainly would !

I use full flapperon because the design is to change the
shape of the whole airfoil, as high performance gliders
have been doing for many years. I love the Rebel's roll rate ! :-)
2 notches of negative flapperon really helps the cruise too...
you don't get the same gain with just flaps - if you even have
negative.

One thing I often see is the dangerous practice of having
the separate flaps droop more than the factory defined
maximum of 18 degrees (same as for flapperons). Anything
more puts excessive load on the 2 flap(peron) support arms -
they might rip off !!! You can see this excess flap on some
YouTube videos of the float Rebels in Newfoundland - they are
the only ones still doing this regularly, at their own peril ...

The Elite has much sturdier flaps, AND --> THREE supports,
so can have more deflection. Still could use more aileron -
Just MHO ... ;-)

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[Andrew Burr]

Ken, that is exactly how it is. The ailerons droop just a little bit. My landing procedure is to lower the flaps till the ailerons stop drooping and the plane is set up nice for landing and I usually fly the plane on to the runway because this is how you want to land with amphibs. The plane lands really nice I have no problems. The gear is giving me some issues coming down but I'm getting it worked out.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and holds ownership of all intellectual property for each component.

--- On Tue, 7/20/10, Ken <klehman@albedo.net> wrote:

From: Ken <klehman@albedo.net>
Subject: Re: [rebel-builders] Flaps/Flapperons
To: rebel-builders@dcsol.com
Date: Tuesday, July 20, 2010, 1:21 AM

If you can droop the ailerons when you select flap then you have the
best of both worlds. I would prefer that setup to my flaperons. As
flaperons are extended the spiraling propwash definitely tries to
deflect them and roll the airplane. Fixed flaps eliminates that. I think
Steve Sloan has the same setup but it is not a MAM option AFAIK.
DeHavilland used this very successfully on their STOL aircraft. Ailerons
automatically drooped with flap (although not as far).
Ken

Andrew Burr wrote:
[quote]I'm swinging an 82 x 42 Borer prop. 700 to 900fpm I can probably do when the temps aren't 115 F. I don't believe the 90Kts at 2300.
So far I don't think changing back to full flaperons is worth the effort.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO

[Bob Patterson]

Hi Andrew !

Those are pretty typical numbers for a Rebel on amphibs.

Normal cruise is in the 108 to 112 mph range at 2,450 or so ...
with a Sensenich 74 x 54 prop ... About 118 mph on wheels
with a 74 x 56. Your prop is a bit on the fine side ... not too
many Rebels have kept their Borers ... Prince, or Catto, are
now the popular choices.

I don't think your split flap setup is anything like the factory
arrangement -- be sure they don't come down more than 18 degrees
if you don't want to lose them !

We're off to Oshkosh in the morning ! :-)

--
......bobp
bobp@prosumers.ca
http://www.amway.ca/BobPatterson
http://bpatterson.qhealthbeauty.com
http://apatterson2.ordermygift.com

Any views expressed in this message are those of the individual sender
and do not necessarily reflect the views of any other entities or persons.
Any action taken as a result of the contents of this email is totally the
responsibility of the reader.

On July 19, 2010 09:07:43 pm Andrew Burr wrote:

I'm swinging an 82 x 42 Borer prop. 700 to 900fpm I can probably do when
the temps aren't 115 F. I don't believe the 90Kts at 2300. So far I don't
think changing back to full flaperons is worth the effort.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and
holds ownership of all intellectual property for each component.

--- On Mon, 7/19/10, jbcressman@aol.com <jbcressman@aol.com> wrote:

From: jbcressman@aol.com <jbcressman@aol.com>
Subject: Re: [rebel-builders] Flaps/Flapperons
To: rebel-builders@dcsol.com
Date: Monday, July 19, 2010, 2:58 PM

Andrew...I have the flaperons on my Rebel with 1800 amphibs and a Sensenich
74 x 53 on an 0-320. I'm off and climbing in 250' at 700-900 fpm. Cruise
indicated at 3000' asl at 2300 rpm trimmed up with 6 degrees negative and
7.8 gpm is 90 kts. I'm with Bob, I love the flaperons! Bob Cressman
331R C-GRBC





---- Original Message ----
From: Walter Klatt <Walter.Klatt@shaw.ca>
To: rebel-builders@dcsol.com
Sent: Mon, Jul 19, 2010 10:41 am
Subject: RE: [rebel-builders] Flaps/Flapperons


What prop do you have, Andrew?

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
Andrew Burr
Sent: Sunday, July 18, 2010 4:09 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights

I have the separate flap mod and I like it . I have no problems landing
short and I have the negative flap. My ailerons droop with the flaps. I
flew an Avid on Hamilton floats with Flapperons and didn't care for it. I
wasn't sure at the time if it was the floats or the flapperons but I didn't
like how it rolled in to a turn. It seemed you had to push it over. I have
my rebel on amphibs right now and it lands so slow I have no problems
getting stopped in 500 ft. I really like how stable the plane flys it has a
great roll rate and very easy to trim hands off. On the amphibs I can get
it off the ground in 250 ft as soon as it hits 50 it is off the ground
about a 500fpm climb is standard but it is really hot right now here in
Missouri (115F). My airspeed trues out at 85 at 2450 rpm cruise flight
with the floats gear up, with the gear down 78 . I have the 0-320. I
really love the way this little plane handles she is a sweet hart. My
airport is Est West so I'm always landing with a cross wind. Like I said
I'm on floats not wheels so landing in a cross wind on a 1000ft strip is
not a issue for me I was thinking of building a Moose while I fly my
Rebel. But with the lack of parts support I'm leaning towards a Bear Hawk
now.

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and
holds ownership of all intellectual property for each component.

--- On Sun, 7/18/10, Bill Maxwell <wrmaxwell@bigpond.com> wrote:

From: Bill Maxwell <wrmaxwell@bigpond.com>
Subject: Re: [rebel-builders] Flaps/Flapperons --- was 254R first flights
To: rebel-builders@dcsol.com
Date: Sunday, July 18, 2010, 10:33 PM

Thanks for that input Bob. I'll certainly file that away for future
reference.

I bought the separate flaps option with my kit, I guess only because
that had been my previous experience base, whereas flapperons were
something I had never experienced. Still plenty of time in which to
switch back to flapperons though and that is where my thinking has been
tending over the past couple of years. Your comments reinforce that view.

I certainly want the "L" back in STOL down here in Tasmania


Bill

Bob Patterson wrote:

Hi Bill !

Yes - I would do the same if stuck with a flaps-only Rebel !

I've flown a few ... one builder told me his was a STO --
no "L" , (not a STOL) since he found it hard to land short ! :-)

Fortunately, there are very few of those --- and a good thing too....

you end up with half the flap and half the aileron - not good for
landing, or crosswinds ! :-( Most who try that setup switch
back to flapperons quickly - I certainly would !

I use full flapperon because the design is to change the

shape of the whole airfoil, as high performance gliders
have been doing for many years. I love the Rebel's roll rate ! :-)
2 notches of negative flapperon really helps the cruise too...
you don't get the same gain with just flaps - if you even have
negative.

One thing I often see is the dangerous practice of having

the separate flaps droop more than the factory defined
maximum of 18 degrees (same as for flapperons). Anything
more puts excessive load on the 2 flap(peron) support arms -
they might rip off !!! You can see this excess flap on some
YouTube videos of the float Rebels in Newfoundland - they are
the only ones still doing this regularly, at their own peril ...

The Elite has much sturdier flaps, AND --> THREE supports,

so can have more deflection. Still could use more aileron -
Just MHO ... ;-)

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[Andrew Burr]

I was kinda wondering if there was a better prop out there. I would love to get those cruise numbers on floats at 2450. I can get 2700 rpm on take off with this prop which tells me it is

[Walter Klatt]

Andrew, if you look back on the archives, I've talked many times about the
props I have used and compared to in flight with the 150 hp 320 on amphibs.
I used a Sensenich 74 X 54, cruised 105 mph, 2400 rpm (near sea level), at
7.5 US gph (2 mags). Climb was 1100 fpm, with 1/2 fuel and solo. Static rpm
was 2500, and straight and level was 2720 topping out at over 120 mph. The
higher static rpm (more power) helped with faster water take-offs. Cruise
was at 65% power.

Pitch makes a big difference in perf with the Sensenich. Don't use the 74 X
56, it has less take-off, climb, and top speed. A couple of guys I used to
fly with, changed their pitch to mine after flying side by side with me, and
they got the numbers too after that.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Tuesday, July 20, 2010 5:13 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons

I was kinda wondering if there was a better prop out there. I would love to
get those cruise numbers on floats at 2450. I can get 2700 rpm on take off
with this prop which tells me it is

[snowyrvr@mtaonline.net]

Hi Walter,

How can the prop have less low end and less high end performance? It seems
that it would be better at one than the other. You know partly why I'm
asking this. I understood that the pitch was like gears in a tranny;
Someone please fill me in. Thanks, Craig

Original Message:
-----------------
From: Walter Klatt Walter.Klatt@shaw.ca
Date: Tue, 20 Jul 2010 07:04:07 -0700
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Flaps/Flapperons


Andrew, if you look back on the archives, I've talked many times about the
props I have used and compared to in flight with the 150 hp 320 on amphibs.
I used a Sensenich 74 X 54, cruised 105 mph, 2400 rpm (near sea level), at
7.5 US gph (2 mags). Climb was 1100 fpm, with 1/2 fuel and solo. Static rpm
was 2500, and straight and level was 2720 topping out at over 120 mph. The
higher static rpm (more power) helped with faster water take-offs. Cruise
was at 65% power.

Pitch makes a big difference in perf with the Sensenich. Don't use the 74 X
56, it has less take-off, climb, and top speed. A couple of guys I used to
fly with, changed their pitch to mine after flying side by side with me, and
they got the numbers too after that.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Tuesday, July 20, 2010 5:13 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons

I was kinda wondering if there was a better prop out there. I would love to
get those cruise numbers on floats at 2450. I can get 2700 rpm on take off
with this prop which tells me it is

[Walter Klatt]

Yeah, a lot of people have misconceptions about this. But if you understand
that more rpm makes more hp which makes more thrust, it makes sense. That's
why people have constant speed props, so they can keep the revs up where the
power is.

At the bottom end, static, a finer pitch prop turns higher, so you get more
power and better take-off. Same is true at the top end, more top rpm, more
power giving you more speed. Simple as that.

And there is no penalty with fuel consumption, another big myth. I did lots
of testing with different props at different pitch settings, and when going
the same speed, fuel consumption was the same (I have a fuel monitor), even
if rpm was higher.

If you over pitch your prop, that's like derating your engine to a lower hp
setting, which is waste of the weight of that engine. You might as well get
as much as you can out of it for the weight it is. If you really want less
hp, get a smaller engine, and save the weight.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
snowyrvr@mtaonline.net
Sent: Tuesday, July 20, 2010 4:45 PM
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Flaps/Flapperons

Hi Walter,

How can the prop have less low end and less high end performance? It seems
that it would be better at one than the other. You know partly why I'm
asking this. I understood that the pitch was like gears in a tranny;
Someone please fill me in. Thanks, Craig

Original Message:
-----------------
From: Walter Klatt Walter.Klatt@shaw.ca
Date: Tue, 20 Jul 2010 07:04:07 -0700
To: rebel-builders@dcsol.com
Subject: RE: [rebel-builders] Flaps/Flapperons


Andrew, if you look back on the archives, I've talked many times about the
props I have used and compared to in flight with the 150 hp 320 on amphibs.
I used a Sensenich 74 X 54, cruised 105 mph, 2400 rpm (near sea level), at
7.5 US gph (2 mags). Climb was 1100 fpm, with 1/2 fuel and solo. Static rpm
was 2500, and straight and level was 2720 topping out at over 120 mph. The
higher static rpm (more power) helped with faster water take-offs. Cruise
was at 65% power.

Pitch makes a big difference in perf with the Sensenich. Don't use the 74 X
56, it has less take-off, climb, and top speed. A couple of guys I used to
fly with, changed their pitch to mine after flying side by side with me, and
they got the numbers too after that.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Tuesday, July 20, 2010 5:13 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons

I was kinda wondering if there was a better prop out there. I would love to
get those cruise numbers on floats at 2450. I can get 2700 rpm on take off
with this prop which tells me it is

[Andrew Burr]

Thanks Walter, it sounds like what you say is what I'm seeing. The plane gets off the ground haven't taking to the water yet. The climb and cruise is pretty poor. I would love to have those numbers i will have to look in to it.
Thanks for the info!

Andrew E Burr XIV

Vertical performance LLc

Po Box 213

Cassville MO 65625



VPHelo, LLc has paid for the design and engineering for every component and holds ownership of all intellectual property for each component.

--- On Tue, 7/20/10, Walter Klatt <Walter.Klatt@shaw.ca> wrote:

From: Walter Klatt <Walter.Klatt@shaw.ca>
Subject: RE: [rebel-builders] Flaps/Flapperons
To: rebel-builders@dcsol.com
Date: Tuesday, July 20, 2010, 2:04 PM

Andrew, if you look back on the archives, I've talked many times about the
props I have used and compared to in flight with the 150 hp 320 on amphibs.
I used a Sensenich 74 X 54, cruised 105 mph, 2400 rpm (near sea level), at
7.5 US gph (2 mags). Climb was 1100 fpm, with 1/2 fuel and solo. Static rpm
was 2500, and straight and level was 2720 topping out at over 120 mph. The
higher static rpm (more power) helped with faster water take-offs. Cruise
was at 65% power.

Pitch makes a big difference in perf with the Sensenich. Don't use the 74 X
56, it has less take-off, climb, and top speed. A couple of guys I used to
fly with, changed their pitch to mine after flying side by side with me, and
they got the numbers too after that.

Walter

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Andrew
Burr
Sent: Tuesday, July 20, 2010 5:13 AM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Flaps/Flapperons

I was kinda wondering if there was a better prop out there. I would love to
get those cruise numbers on floats at 2450. I can get 2700 rpm on take off
with this prop which tells me it is