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  #1  
Old 12-03-2018, 01:19 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 2,550
Default Heavy wing

Just wondering if anyone has a solution to a heavy wing for the RV14?
I have a heavy wing on the right side and it is within my aileron trim range but I would like to fix it if I can.

I have double checked my rigging and the ailerons are set pretty darn precise using the provided jig. My method of checking is to set the jig on one side/aileron and hold that aileron in a fixed position then moving the jig to the other side, it comes to a perfect match. Then the flaps are set to the same level in relation to the ailerons on both side. When they are fully retracted, they are about a hair lower than the ailerons. I am not so much interested in adding a wedge to the aileron if there is other methods that can be done.

In other RV models (6/7) we can squeeze the aileron trailing edge or replace the hinge bracket which is bolted to the ailerons but in 14, they are riveted and not easily replaceable.

I was wondering if any other things can be checked/modified to get a more balanced setting in roll?

As always appreciate all thoughts and suggestions.
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  #2  
Old 12-03-2018, 02:42 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Default

I think the -14 wing is like the -10, if so, youíre doing it backwards.
1. Flaps up should be against the aft spar.
2. Ailerons match flaps (make sure elevator is neutral)
3. Adjust tips to match ailerons.
4. Sight down the wing, front to back, checking that both ailerons are the same vertical height at their leading edges. If this needs fixing either slot the mounting bracket(s) or buy new, undrilled ones.
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  #3  
Old 12-03-2018, 04:07 PM
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Jared_Solomon Jared_Solomon is offline
 
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Default is the ball centered?

Have you checked that your ball is centered in level flight. That will give you some insight into whether or not there is a yawing moment, that could be causing the heavy wing.
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  #4  
Old 12-03-2018, 04:11 PM
Bavafa Bavafa is offline
 
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Default

I would need to get confirmation on this from others as I am not familiar with the 10s setup but with 14, as part of the kit, we get a jig that you use to setup the aileron to the neutral position.
Next time I am at the hanger, I will check to see where is my elevator when my aileron are in the neutral position.
As for my flaps go, they are pretty much as high as they will go. One side (pilot side) goes up another half a degree or so but now I have set them to match.
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  #5  
Old 12-03-2018, 04:16 PM
n982sx n982sx is offline
 
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Location: Chicago, IL
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Default

Quote:
Originally Posted by BobTurner View Post
I think the -14 wing is like the -10
Like is the operative word. He is not doing it wrong from what I can tell from his write up.

The 14 is provided with two jigs, one to ensure the aileron bell crank is in the neutral position while using the other to set the aileron. The wing tips are also set with the aileron alignment tool so they match the aileron neutral position.

The flaps are set so that when fully retracted, they are at -7į relative to the upper longeron. This is easy to do with a digital level.

Setting both the ailerons and flaps per the 14 plans yielded a great result on my airplane.

Not advising this since I have no idea as to whether this a good idea for the 14, but on my Sonex, the accepted cure for a slight heavy wing was to lower the flap on the heavy wing a half turn on the rod end bearing. I used this procedure on my Sonex and it fixed the slightly heavy wing issue.
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  #6  
Old 12-03-2018, 04:35 PM
Bavafa Bavafa is offline
 
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Quote:
Originally Posted by Jared_Solomon View Post
Have you checked that your ball is centered in level flight. That will give you some insight into whether or not there is a yawing moment, that could be causing the heavy wing.
Hi Jared,
Yes, I am good with the yaw, the ball is centered pretty nicely
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  #7  
Old 12-03-2018, 04:38 PM
Bavafa Bavafa is offline
 
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Quote:
Originally Posted by n982sx View Post
Not advising this since I have no idea as to whether this a good idea for the 14, but on my Sonex, the accepted cure for a slight heavy wing was to lower the flap on the heavy wing a half turn on the rod end bearing. I used this procedure on my Sonex and it fixed the slightly heavy wing issue.
Bob,
I thought of doing that but I guess that is adding some additional drag that otherwise wouldn't be there. I may still play with that to see if no other ideas come to mind. Would you lower it on the heavy wing or the light side? If you lower it on the heavy side, wouldn't that create a bit more lift?
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  #8  
Old 12-03-2018, 04:56 PM
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Steve Melton Steve Melton is offline
 
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Default

flaps should be set to the wing and nothing else. measure from a rivet on the wing to the trailing edge on the flap and set the same on both wings.
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  #9  
Old 12-03-2018, 04:58 PM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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Default

Donít rely on the jigs as truth - they just get you in the ball park.

Here is a thread I posted a step by step process: http://www.vansairforce.com/communit...=165907&page=2

Iím guessing you also fitted the wingtips before rigging the plane (as in wings on the plane). This could result in the wingtip trailing edges not aligned with the ailerons. You may need to redo one or both.

Carl
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  #10  
Old 12-03-2018, 05:49 PM
Bavafa Bavafa is offline
 
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Quote:
Originally Posted by Steve Melton View Post
measure from a rivet on the wing to the trailing edge on the flap and set the same on both wings.
Steve,
Can you elaborate on this a bit more please?
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