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  #1  
Old 05-10-2019, 09:03 AM
mark960 mark960 is offline
 
Join Date: Mar 2010
Location: Long Island NY / Ft Myers FL
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Default Aileron Rigging

Is there any way to check the aileron rigging without taking off the wingtips???

My ailerons are about a ¼” lower than the flaps which are not fully flush either. It may be normal, but it doesn’t look right. The wingtip screws are painted on and I don't want to mess up the paint.

Mark K
N1075 RV9A



FLAPS Fully Retracted
[IMG][/IMG]

LEFT Aileron
[IMG][/IMG]

RIGHT Aileron
[IMG][/IMG]
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  #2  
Old 05-10-2019, 09:35 AM
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M McGraw M McGraw is offline
 
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Location: Greenback, TN
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Default Yes there is a way to rig without removing the wingtip

Mark,
I see the pictures of your aileron above. My questions would be how do they look in flight and does the plane fly level without trim?

You have two rod ends for each aileron (one at the aileron and one at the bellcrank in the wing). One full turn of a rod end is worth about 1/16” inch. I adjusted mine to trail with the flaps (at the inflight condition). Additionally, You can adjust them to counteract any heavy wing condition.

NOTE: be certain to comply with any minimum thread requirements as stated by Vans
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Last edited by M McGraw : 05-10-2019 at 09:37 AM.
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  #3  
Old 05-10-2019, 09:36 AM
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Raymo Raymo is offline
 
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Flaps are generally in a "reflex" position, meaning they will be a little higher than the ailerons. I believe the goal is to have the flaps up against the rear spar so the flap mechanism is not under load during normal flight. Some prefer to make everything line up, but it is very build specific due to wing mount variations.

The tips should come off at each condition inspection, so the screws shouldn't be a concern. Replace with stainless, IMO.
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  #4  
Old 05-10-2019, 09:47 AM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Make sure when you rig the ailerons, that the elevator is held or locked neutral.
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  #5  
Old 05-10-2019, 10:24 AM
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Carl Froehlich Carl Froehlich is online now
 
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Default

To the OP question, yes you can check aileron rigging without taking off the wingtips.

But, you have multiple issues to be checked and fixed. If you rely on the “tooling holes” approach to rigging you can easily end up with rigging problems. I’ve seen a lot of RVs not properly rigged. Rigging is not “one and done”.

Here is one of a few posts I made on rigging: http://www.vansairforce.com/communit...=165907&page=2

For builders not yet there, I again strongly recommend deferring wingtip fit-up until after the wings, flaps and ailerons are mounted and rigged.

Carl
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  #6  
Old 05-10-2019, 10:49 AM
rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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It looks like the flaps and the ailerons are mis-rigged, but there can be numerous other things that can cause mis-alignments between wing tips ailerons and flaps and fuselage. One major one is twists in the control surfaces. This can be checked for by measuring the angle of a surface at each end while holding it stationary. If they are not twisted, the measured angle should be the same at both ends.
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  #7  
Old 05-10-2019, 02:28 PM
mark960 mark960 is offline
 
Join Date: Mar 2010
Location: Long Island NY / Ft Myers FL
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Quote:
Originally Posted by M McGraw View Post
Mark,
I see the pictures of your aileron above. My questions would be how do they look in flight and does the plane fly level without trim?

You have two rod ends for each aileron (one at the aileron and one at the bellcrank in the wing). One full turn of a rod end is worth about 1/16” inch. I adjusted mine to trail with the flaps (at the inflight condition). Additionally, You can adjust them to counteract any heavy wing condition.

NOTE: be certain to comply with any minimum thread requirements as stated by Vans

The ailerons in flight are roughly the same as shown, both below the flaps in level flight. The aircraft does not exhibit any wing heavy condition.

I don't think one aileron being up or down would cause a wing heavy condition. A wing heavy condition would be caused and corrected by adjusting the flap trim.


What's got me started down this road, is I have a friend with another RV9A with same engine, and his aircraft is faster by 5-10 knots. That was confirmed by running both aircraft WOT side by side at multiple altitudes. (I know there are lots of things that could be causing the speed difference. The trim is what I'm focusing on now.)
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  #8  
Old 05-10-2019, 03:16 PM
rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by mark960 View Post
What's got me started down this road, is I have a friend with another RV9A with same engine, and his aircraft is faster by 5-10 knots.
I'm not surprised
As I mentioned it looks like your ailerons and flaps are both miss rigged. This wont necessarily cause a roll trim problem any more than flying around with your flaps partially deployed will.

But, if your ailerons and flaps are both drooped downward it will definitely cause drag and a loss of speed.
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  #9  
Old 05-10-2019, 07:37 PM
Hornet2008 Hornet2008 is offline
 
Join Date: Jul 2010
Location: NSW Australia
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I have rigged my ailerons with the tooling holes and bellcrank locking plate during initial rigging and checked at last condition inspection and still get a roll to the left in flight. Could I eliminate this roll by adjusting flaps? Thanks in advance.
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  #10  
Old 05-10-2019, 07:50 PM
mark960 mark960 is offline
 
Join Date: Mar 2010
Location: Long Island NY / Ft Myers FL
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Quote:
Originally Posted by Hornet2008 View Post
I have rigged my ailerons with the tooling holes and bellcrank locking plate during initial rigging and checked at last condition inspection and still get a roll to the left in flight. Could I eliminate this roll by adjusting flaps? Thanks in advance.

A "heavy wing" is caused by the wings producing a different amount of lift on each side. YES, adjusting the flaps will correct this problem. A single turn of the turnbuckle results in a very noticeable change. My plane would bank and turn to the left with hands off. It took only a half turn to correct it.
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