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Rebel Flaperon Control System

Converted from Wildcat! database. (read only)
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Wayne G. O'Shea

Rebel Flaperon Control System

Post by Wayne G. O'Shea » Fri Feb 17, 2012 11:50 pm

I posted 5 Pics to "Rebel - Tail Feathers" of the Elevator Trim Tab Horn SB
and the doubler that I had to install as mine had cracked the flange off the
front spar as well.

Wayne

----- Original Message -----
From: "Wayne G. O'Shea" <oifa@irishfield.on.ca>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, September 13, 2003 5:22 PM
Subject: Re: Rebel Flaperon Control System

As Bob states this is a better now than later item! When mine starting
letting go it had cracked the front spar in the trim tab as well. Required
opening up and inserting a spar doubler. I believe I have some pics of my
repair job if anyone is interested for me to post them to the archives (if
I
already didn't put them there, will have a look!)

The one thing to watch even after doubling up the horn is to make sure
that
you have some skin to spar rivets on each side of the servo rod horns. The
original rivet pitch left a fair space between the rivets and the horn and
this allows the area to work even more.

I'm harder on this area than most people as I use full stick forward and
lots of power all winter long lifting the tail up and out of the snow
before
I move anywhere on skis and anyone that has witnessed my summer takeoffs
as
well knows that I love to lift the tail before I have moved forward for a
shorter take off run (and also promotes less stress to the airframe on
rough
fields with the tailwheel up from the get-go!)

Cheers,
Wayne

----- Original Message -----
From: "Bob Patterson" <apat@istar.ca>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, September 13, 2003 4:25 PM
Subject: Re: Rebel Flaperon Control System

Hi Brian !

I would STRONGLY recommend it !! Catch me at the Builders
Meeting tomorrow, or at the Corn/Pig Roast tonight (6 pm), for
more details . I'd be interested in having a look at your elevator
and trim - I'll show you what happened to mine in only about 200 Hr. !
There are other factors, besides the need for a stronger trim tab
horn ....

This mod is very important for faster Rebels - the chances of
flutter increase dramatically with speed - something to think about
on those long high-speed descents from 9,500 feet that I did a lot
of this summer ! (Leave power about 2,300+ rpm to avoid shock cooling,
and set up for 400 - 500 fpm descent by increasing cruise speed -
gives fuel economy and faster times point-to-point)

.....bobp

----------------------------------orig.------------------------------
At 02:37 PM 9/13/03 -0400, you wrote:
Hi Ken

I was not able to find that Service Bulletin on the MAM site. Can this
doubler be added on a flying Rebel?

Thanks

Brian #328R


At 10:56 PM 9/12/2003 -0400, you wrote:
trim
can
the
is
between
as
a
trim
the
failed. I
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Brian Cross

Rebel Flaperon Control System

Post by Brian Cross » Fri Feb 17, 2012 11:50 pm

Hi Ken

Thanks very much for the info. I will get right on that. Sounds pretty
important. Are you going to be at the meeting tomorrow?

All the best & thanks again

Brian #328R

At 04:25 PM 9/13/2003 -0400, you wrote:
Hi Brian

Sure although I added a larger flat doubler on the trim tab underneath
mine. Don't know if you'd need to do that. I also tried to make the
horns almost the full width of the trim tab.

As I recall MAM wants a mirror image of the existing horn riveted to the
existing horn. If the existing horn looks like an upside down capital L
then the doubled horn would look like an upside down capital T. Two L's
riveted back to back so to speak.

MAM doesn't put out a lot of bulletins or frivolous ones so I tend to
treat what they do put out as mandatory AD's.

Ken

Brian Cross wrote:
Hi Ken

I was not able to find that Service Bulletin on the MAM site. Can this
doubler be added on a flying Rebel?

Thanks

Brian #328R


At 10:56 PM 9/12/2003 -0400, you wrote:
Bruce
There is indeed a MAM bulletin to double the trim horn on all 0-320 trim
tabs and also recommending it on all Rebels regardless of engine. I can
look it up but I've had it for a few years I believe.

Roger
FWIW I used angle brackets at the rear of those channels to tie into the
bulkhead. Same as on the ends of all the floor channels. I think that is
what they mean by gussets. You are correct though that it is a busy
area. There is a doubler there on the bulkhead over the cutout in the
top of the bulkhead. I replaced that doubler over the cutout on the
bulkhead with a much larger doubler. Then I arranged for some of the
same rivets to fasten both the doubler and the angle brackets. If I
remember correctly, you should also offset the rivets in the doubled
bulkhead so that they don't interfere with each other in the gap between
the doubled bulkheads. ie. when installing those doublers don't drill
straight through both bulkheads as the rivet from the rear would then
interfere with the rivet from the front.
Ken

Legeorgen@aol.com wrote:
double
decided it
tap horn
single


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Brian Cross

Rebel Flaperon Control System

Post by Brian Cross » Fri Feb 17, 2012 11:50 pm

HI Bob

Thanks very much for your concern. I plan on being there tomorrow but
cannot make it for 1300H but will get there as soon as I can.

Best regards

Brian

At 04:25 PM 9/13/2003 -0400, you wrote:
Hi Brian !

I would STRONGLY recommend it !! Catch me at the Builders
Meeting tomorrow, or at the Corn/Pig Roast tonight (6 pm), for
more details . I'd be interested in having a look at your elevator
and trim - I'll show you what happened to mine in only about 200 Hr. !
There are other factors, besides the need for a stronger trim tab
horn ....

This mod is very important for faster Rebels - the chances of
flutter increase dramatically with speed - something to think about
on those long high-speed descents from 9,500 feet that I did a lot
of this summer ! (Leave power about 2,300+ rpm to avoid shock cooling,
and set up for 400 - 500 fpm descent by increasing cruise speed -
gives fuel economy and faster times point-to-point)

.....bobp

----------------------------------orig.------------------------------
At 02:37 PM 9/13/03 -0400, you wrote:
Hi Ken

I was not able to find that Service Bulletin on the MAM site. Can this
doubler be added on a flying Rebel?

Thanks

Brian #328R


At 10:56 PM 9/12/2003 -0400, you wrote:
Bruce
There is indeed a MAM bulletin to double the trim horn on all 0-320 trim
tabs and also recommending it on all Rebels regardless of engine. I can
look it up but I've had it for a few years I believe.

Roger
FWIW I used angle brackets at the rear of those channels to tie into the
bulkhead. Same as on the ends of all the floor channels. I think that is
what they mean by gussets. You are correct though that it is a busy
area. There is a doubler there on the bulkhead over the cutout in the
top of the bulkhead. I replaced that doubler over the cutout on the
bulkhead with a much larger doubler. Then I arranged for some of the
same rivets to fasten both the doubler and the angle brackets. If I
remember correctly, you should also offset the rivets in the doubled
bulkhead so that they don't interfere with each other in the gap between
the doubled bulkheads. ie. when installing those doublers don't drill
straight through both bulkheads as the rivet from the rear would then
interfere with the rivet from the front.
Ken

Legeorgen@aol.com wrote: double decided it tap horn single
failed. I


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Brian Cross

Rebel Flaperon Control System

Post by Brian Cross » Fri Feb 17, 2012 11:50 pm

HI Wayne

Thank you as well for detailing this problem. I certainly will give it
close attention. You get so reliant on this fine airplane that you start
to think nothing could/would ever go wrong. This emphasizes the importance
of this group to me.

Thank you all.

Sincerely

Brian #328R

At 05:22 PM 9/13/2003 -0400, you wrote:
As Bob states this is a better now than later item! When mine starting
letting go it had cracked the front spar in the trim tab as well. Required
opening up and inserting a spar doubler. I believe I have some pics of my
repair job if anyone is interested for me to post them to the archives (if I
already didn't put them there, will have a look!)

The one thing to watch even after doubling up the horn is to make sure that
you have some skin to spar rivets on each side of the servo rod horns. The
original rivet pitch left a fair space between the rivets and the horn and
this allows the area to work even more.

I'm harder on this area than most people as I use full stick forward and
lots of power all winter long lifting the tail up and out of the snow before
I move anywhere on skis and anyone that has witnessed my summer takeoffs as
well knows that I love to lift the tail before I have moved forward for a
shorter take off run (and also promotes less stress to the airframe on rough
fields with the tailwheel up from the get-go!)

Cheers,
Wayne

----- Original Message -----
From: "Bob Patterson" <apat@istar.ca>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, September 13, 2003 4:25 PM
Subject: Re: Rebel Flaperon Control System

Hi Brian !

I would STRONGLY recommend it !! Catch me at the Builders
Meeting tomorrow, or at the Corn/Pig Roast tonight (6 pm), for
more details . I'd be interested in having a look at your elevator
and trim - I'll show you what happened to mine in only about 200 Hr. !
There are other factors, besides the need for a stronger trim tab
horn ....

This mod is very important for faster Rebels - the chances of
flutter increase dramatically with speed - something to think about
on those long high-speed descents from 9,500 feet that I did a lot
of this summer ! (Leave power about 2,300+ rpm to avoid shock cooling,
and set up for 400 - 500 fpm descent by increasing cruise speed -
gives fuel economy and faster times point-to-point)

.....bobp

----------------------------------orig.------------------------------
At 02:37 PM 9/13/03 -0400, you wrote:
Hi Ken

I was not able to find that Service Bulletin on the MAM site. Can this
doubler be added on a flying Rebel?

Thanks

Brian #328R


At 10:56 PM 9/12/2003 -0400, you wrote:
a
failed. I
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Walter Klatt

Rebel Flaperon Control System

Post by Walter Klatt » Fri Feb 17, 2012 11:50 pm

I just learned about this mod this weekend, too, and
need to fix mine, too.

Walter
-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Brian Cross
Sent: Saturday, September 13, 2003 7:37 PM
To: murphy-rebel@dcsol.com
Subject: Re: Rebel Flaperon Control System


HI Wayne

Thank you as well for detailing this
problem. I certainly will give it
close attention. You get so reliant on this
fine airplane that you start
to think nothing could/would ever go wrong.
This emphasizes the importance
of this group to me.

Thank you all.

Sincerely

Brian #328R

At 05:22 PM 9/13/2003 -0400, you wrote:
As Bob states this is a better now than
later item! When mine starting
letting go it had cracked the front spar in
the trim tab as well. Required
opening up and inserting a spar doubler. I
believe I have some pics of my
repair job if anyone is interested for me
to post them to the archives (if I
already didn't put them there, will have a look!)

The one thing to watch even after doubling
up the horn is to make sure that
you have some skin to spar rivets on each
side of the servo rod horns. The
original rivet pitch left a fair space
between the rivets and the horn and
this allows the area to work even more.

I'm harder on this area than most people as
I use full stick forward and
lots of power all winter long lifting the
tail up and out of the snow before
I move anywhere on skis and anyone that has
witnessed my summer takeoffs as
well knows that I love to lift the tail
before I have moved forward for a
shorter take off run (and also promotes
less stress to the airframe on rough
fields with the tailwheel up from the get-go!)

Cheers,
Wayne

----- Original Message -----
From: "Bob Patterson" <apat@istar.ca>
To: <murphy-rebel@dcsol.com>
Sent: Saturday, September 13, 2003 4:25 PM
Subject: Re: Rebel Flaperon Control System

Hi Brian !

I would STRONGLY recommend it !!
Catch me at the Builders
Meeting tomorrow, or at the Corn/Pig
Roast tonight (6 pm), for
more details . I'd be interested in
having a look at your elevator
and trim - I'll show you what happened
to mine in only about 200 Hr. !
There are other factors, besides the
need for a stronger trim tab
horn ....

This mod is very important for
faster Rebels - the chances of
flutter increase dramatically with speed
- something to think about
on those long high-speed descents from
9,500 feet that I did a lot
of this summer ! (Leave power about
2,300+ rpm to avoid shock cooling,
and set up for 400 - 500 fpm descent by
increasing cruise speed -
gives fuel economy and faster times
point-to-point)
.....bobp
----------------------------------orig.------
------------------------
At 02:37 PM 9/13/03 -0400, you wrote:
Bulletin on the MAM site. Can this
double the trim horn on all 0-320 trim
Rebels regardless of engine. I can
years I believe.
of those channels to tie into the
the floor channels. I think that is
correct though that it is a busy
bulkhead over the cutout in the
doubler over the cutout on the
Then I arranged for some of the
and the angle brackets. If I
offset the rivets in the doubled
with each other in the gap between
installing those doublers don't drill
rivet from the rear would then
channel between bulkheads now as
a
and pondered doubling mine but
mentioning he lost his electric trim
experience. On landing it was noticed the
trim tap on newer models) had
failed. I
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klehman

Rebel Flaperon Control System

Post by klehman » Fri Feb 17, 2012 11:50 pm

I have uploaded section 6.1 of the manual for the trim tab which is what
bulletin 110520Reb says to use for doubling the horn. I can type out the
bulletin if anybody wants it but it is just one paragraph that refers
to the new section 6.1.

Mike - Looks like my first attempt put an extraneous 0 byte file on the
system that will need deleting.

Ken

Bob Patterson wrote:
Hi Ken !

I'd appreciate it if you could find that bulletin - and
a web address for it, if you have it.

I'll be talking about this, and a couple of other areas,
at the Builders Meeting on Sunday - these are NOT "nice-to-do" things,
they are ABSOLUTELY NECESSARY !!! (still shaking !! :-( )

Bruce only heard about the partially-broken (by a stone
on takeoff) trim tab horn - the 'field-repaired' one tore completely off
over New Brunswick, and I payed an unscheduled visit to Mr. McCain's
private runway !! Sure glad it was close !

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