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-   -   Does wing tip need a trim? (https://vansairforce.net/community/showthread.php?t=129019)

Barneybc12d 08-26-2015 09:09 PM

Does wing tip need a trim?
 
My wing tip is 1/4" longer than the aileron. To trim or not to trim, that is the question.

I had a 5/16" twist in this aileron before I took it apart and reassembled. Ended up with 1/8" of twist.

The trailing edge of the tip also has a 3/16" offset from the aileron trailing edge.

I am going to take 2 beers and go to bed.


Infidel 08-26-2015 09:35 PM

Only two? .....don't mind me, I've already a head start.:D

bobmarkert 08-27-2015 06:22 AM

split fairing
 


Grab your hacksaw blade holder and split the back of the fairing

Butter the inside of the split with a generous epoxy/flox mixture. Make sure you put it deep enough into the fairing because you will sand/file off the back of the fairing into this mixture.



Raise the flaps and make a straight line with the flap, aileron and fairing. Notice the aileron wind gust lock holding everything straight. Use wood and clamp on the fairing. Put saran wrap down to keep from gluing stuff you don’t want glued

Use a long file to straighten the edge. I used a 3 foot aluminum channel with sandpaper glued onto it.



Upgrade from beer.... you've earned it!

newtech 08-27-2015 06:25 AM

Quote:

Originally Posted by Barneybc12d (Post 1009259)
My wing tip is 1/4" longer than the aileron. To trim or not to trim, that is the question.

I called the factory on a similar build question. Reply I got was "there are two reasons to redo a part; first is safety and the second is if you will say 'oh s**t' every time you look at it." This obviously falls in the second category so it all depends on how you answer the question. I would get out the sanding board and trim up that wing tip.

Tom Martin 08-27-2015 08:21 AM

Personally I would trim the part, as described by the previous poster. However I would not install the tip until the wing is on the airplane and the flaps and ailerons are lined up in their final position. This allows you to set the tip to line up with those control surfaces.

bobmarkert 08-27-2015 08:33 AM

Agreeded
 
I agree. Make sure your flight controls are totally rigged and aligned side to side before splitting and reglueing the tips back together. There is some ability to correct vertical alignment too. I waited until I was flying and properly rigged before I did this to my tips.

Mike H 08-27-2015 05:44 PM

My tips extend aft of the ailerons as well. I may sand them down later after the wings are mounted and I am getting close to being finished. The -14 kits have a rigging tool that fairs the aileron surface so that the tip can be located correctly. There is also some reflex in the ailerons so you do not want to rig them to the flaps.

HeliCooper 08-28-2015 01:32 PM

Quote:

Originally Posted by Mike H (Post 1009515)
There is also some reflex in the ailerons so you do not want to rig them to the flaps.

Can you explain what this means to me?

Thanks

Ron B. 08-28-2015 01:46 PM

Quote:

Originally Posted by HeliCooper (Post 1009707)
Can you explain what this means to me?

Thanks

The flaps are actually above the normal lines of the wing( take a straight edge under the wing and the flaps do not follow the straight edge , they are above it a bit) in the reflex position. Van's has found the aircraft actually flies faster when in reflex position.

HeliCooper 08-28-2015 03:20 PM

Thanks Ron. So this means when properly rigged the flaps with be slightly above the ailerons correct? Or are both the flaps and ailerons in the reflex position?


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