The Murphy Builders Site

Hello Rebelheads:

Rebel
Chapter 10 Wing Assembly
Fig. 10.14.2 and 10.14.5

I am in the process of rigging my Rebel flaperons to the LEFT wing and have
a question for you.

This may be a little late for me, as I have already completed my RIGHT wing
flaperon rigging some time ago (in which I thought my geometry ASSumptions
were correct).

The instruction manual gives the pushrod dimension of 7-5/8 inches long
(center-to-center) on the pushrod end bearings. If I remember correctly this
7-5/8 inch dimension seemed very long as the control horn would hit the slot
ends. The slot was cut per plans dimensions.

When I was rigging the right wing flaperon, the (7-5/8) dimension came out
to 6-13/16. Here is how I came to that dimension: Prior to drilling the root
end control horn, I leveled the wing and flaperons per plans. With the main
wing control horn basically centered fore and aft in the main wing slot, I
accomplished the "up" and "down" +20 & -35 (-40) degree rigging of the
flaperons. This is where I came up with the 6-13/16 dimension. If I recall,
this gave me the full range up (+20) and down (-35/-40 ) flaperon with
approx. 3/8 inch remaining at the forward end and 5/8 inches at the aft end
of the main wing control horn slot.

Before I go too far with my now in-progress left wing flaperon rigging, I
wanted to insure that the rigging I accomplished on my right wing was
correct (after the fact though).

1. Is my 6-13/16 inch pushrod the correct length? If not, what is the
correct length?

2. If my wing pushrod is too short, is there a fix for this to get to the
correct length? Should I lengthen it or just make the left wing pushrod the
same (6-3/16) as the completed right one and continue on with life?

Looking back, I am not sure if I did the rigging on the right wing correctly
and am in need of some suggestions.

I hope I am clear in my description on this procedure.

Thanks in advance.

Terry Dazey
Sumner, Washington USA
Rebel 662





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Hello from Rebel Land
Hi Terry
I looked in my Manual/notes and my rod length ended up at 6.75 inches (center
to center of bolt hole).
It looks like the first attempt per the OLD manual (7-27-94) directions was a
"throw away and buy more parts for the next try" as MAM called for 8.25
inches rod length. Based on the ugly comments in my notes I am not sure how
many tries it took to come up with the final length.
Doesn't it make you wonder why MAM does not put the correct dimension in the
Manual or why they don't give the newer manual on CD rom for us folks that
paid the big bucks for the kit just before the price dropped a few thousand
dollars (sale price)?
Jim R254



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Hi Terry !

Sounds like you've done a great job ! Don't sweat the
measurements too much - from what most of the builders have done, it
seems you're right in the ballpark.

As long as you can get the correct deflections, don't worry
about the lengths. You may find that one side needs to be slightly
longer or shorter than the other .... (the geometry isn't quite
symmetrical ..)

There's lots of ways to juggle the flapperon settings, by
changing the adjustments on all the different pushrods, so, if you're
getting the correct deflections - don't worry ! You can always fine-tune
them later, after flying.

Keep on rivetting - it REALLY <IS> WORTH IT !!!! :-)

....bobp

PS
Anyone who wants the newest manual on CD can ask for it -
but it may cause confusion if you have an older kit ..

--------------------------------orig.--------------------------------
At 07:13 PM 12/21/01 -0800, you wrote:

Hello Rebelheads:

Rebel
Chapter 10 Wing Assembly
Fig. 10.14.2 and 10.14.5

I am in the process of rigging my Rebel flaperons to the LEFT wing and have
a question for you.

This may be a little late for me, as I have already completed my RIGHT wing
flaperon rigging some time ago (in which I thought my geometry ASSumptions
were correct).

The instruction manual gives the pushrod dimension of 7-5/8 inches long
(center-to-center) on the pushrod end bearings. If I remember correctly this
7-5/8 inch dimension seemed very long as the control horn would hit the slot
ends. The slot was cut per plans dimensions.

When I was rigging the right wing flaperon, the (7-5/8) dimension came out
to 6-13/16. Here is how I came to that dimension: Prior to drilling the root
end control horn, I leveled the wing and flaperons per plans. With the main
wing control horn basically centered fore and aft in the main wing slot, I
accomplished the "up" and "down" +20 & -35 (-40) degree rigging of the
flaperons. This is where I came up with the 6-13/16 dimension. If I recall,
this gave me the full range up (+20) and down (-35/-40 ) flaperon with
approx. 3/8 inch remaining at the forward end and 5/8 inches at the aft end
of the main wing control horn slot.

Before I go too far with my now in-progress left wing flaperon rigging, I
wanted to insure that the rigging I accomplished on my right wing was
correct (after the fact though).

1. Is my 6-13/16 inch pushrod the correct length? If not, what is the
correct length?

2. If my wing pushrod is too short, is there a fix for this to get to the
correct length? Should I lengthen it or just make the left wing pushrod the
same (6-3/16) as the completed right one and continue on with life?

Looking back, I am not sure if I did the rigging on the right wing correctly
and am in need of some suggestions.

I hope I am clear in my description on this procedure.

Thanks in advance.

Terry Dazey
Sumner, Washington USA
Rebel 662



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Terry! This is a dangerous question to ask the list for a measurement on!!
If your first wing had full defection, as shown in the flaperon set up
instructions, with the length you decided on for the push pull and it has
this deflection <without> the control horn at the root going outside an
imaginary extension of the wing skins (so they stay inside the fairings when
you are going full deflection) you will be fine. Do the second wing EXACTLY
the same. When you get to finally assembly and fab/install the torque tube
through the cabin you will adjust the horns there to allow full deflection
again, without them hitting the cabin roof. FWIW, I was never able to make
MAM's long dimension work for the PP's and they also have changed the slot
location a couple times. That is why it is dangerous to ask about other
Rebels dimensions, as there are too many variables. I have been using a
length of 6 1/8" for years for the C/C length (touch on the short side but
it works good!).

The easiest way to play with this item is to take a 3/4" wide strip of 3/8
plywood or similar. Mark lengths at dimensions from my suggest 6 1/8" and up
at a 1/4" to 3/8" at a time and drill 1/4" holes. Then try the longest and
work back until it works. The idea is to get the full deflection needed,
while having the wing horns "output" hole as close to perpendicular with the
bottom skin as possible when the flaperon is neutral. This will give you the
lightest control forces possible. Worry about making the push pull tubes
later, when you are doing the inside controls and do them all at the same
time!

The torque tubes horns would be alot nicer to do if MAM had used a
measurement from the rear spar to the horn, similar to the measurement that
is given from the wing skin to the wing root torque tube horn. That way you
could just clamp the wing horn in place and then position/drill/rivet the
root horn in place, with no need to play with the flaperon on the wing. That
way everyone's Rebel would be the same. Would also make it easier when
someone unfortunately wrecks a wing to pick up used one and not have to play
with the horn geometry to make it work. I hope it never happens to any of
you, but for the back of all your minds I do have a spare left wing, as the
customer wanted a new one for piece of mind (POM) even though 8 hours would
have fixed the old one!

Good luck,
Wayne G. O'Shea
www.irishfield.on.ca

----- Original Message -----
From: "Terry Dazey" <dazey@earthlink.net>
To: <murphy-rebel@dcsol.com>
Sent: Friday, December 21, 2001 10:13 PM
Subject: Rebel Flaperon Geometry ASSumptions

Hello Rebelheads:

Rebel
Chapter 10 Wing Assembly
Fig. 10.14.2 and 10.14.5

I am in the process of rigging my Rebel flaperons to the LEFT wing and

have

a question for you.

This may be a little late for me, as I have already completed my RIGHT

wing

flaperon rigging some time ago (in which I thought my geometry ASSumptions
were correct).

The instruction manual gives the pushrod dimension of 7-5/8 inches long
(center-to-center) on the pushrod end bearings. If I remember correctly

this

7-5/8 inch dimension seemed very long as the control horn would hit the

slot

ends. The slot was cut per plans dimensions.

When I was rigging the right wing flaperon, the (7-5/8) dimension came out
to 6-13/16. Here is how I came to that dimension: Prior to drilling the

root

end control horn, I leveled the wing and flaperons per plans. With the

main

wing control horn basically centered fore and aft in the main wing slot, I
accomplished the "up" and "down" +20 & -35 (-40) degree rigging of the
flaperons. This is where I came up with the 6-13/16 dimension. If I

recall,

this gave me the full range up (+20) and down (-35/-40 ) flaperon with
approx. 3/8 inch remaining at the forward end and 5/8 inches at the aft

end

of the main wing control horn slot.

Before I go too far with my now in-progress left wing flaperon rigging, I
wanted to insure that the rigging I accomplished on my right wing was
correct (after the fact though).

1. Is my 6-13/16 inch pushrod the correct length? If not, what is the
correct length?

2. If my wing pushrod is too short, is there a fix for this to get to the
correct length? Should I lengthen it or just make the left wing pushrod

the

same (6-3/16) as the completed right one and continue on with life?

Looking back, I am not sure if I did the rigging on the right wing

correctly

and am in need of some suggestions.

I hope I am clear in my description on this procedure.

Thanks in advance.

Terry Dazey
Sumner, Washington USA
Rebel 662



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Rebelheads:

Thanks guys for the great information on my Flaperon geometry question.

I will make my left wing push rod EXACTLY like the right wing and adjust
from there.

You are correct about answers to the question on the length of the push rods
Wayne. I have talked to several of my local Rebel builders/flyers (via
phone) and each gave me a different length. I guess I am a stickler for
building EXACTLY what the plans callout, BUT . . . sometimes, it just aint
so.

Thanks again for all the great information . . .past . . .present . . .and
future.

Your Pilot Pal,
Terry Dazey
R662





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