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  #1  
Old 11-06-2021, 12:06 AM
TASEsq TASEsq is offline
 
Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 360
Default Aileron Twist??

I am up to page 22-08 where i have riveted the aileron nose ribs to the nose skin. Once the nose ribs are riveted in place, the skin really isnt very stable - is this normal?

The next step was to install the aileron spar - and learning from my flap experience, i thought i better check that there was no twist in the spar before install.

I placed it on a bench i know is perfectly flat and checked for any rocking, and twisted the spar to correct this. The winding sticks show that it is flat - no twist.

However, when i install it into the skins there is a lot of twist present. Presumably, this is caused by the skin itself - which i am not really sure how this is possible. The nose rib rivets all seemed to go in fine - some needed a little persuading, which i assumed was due to the tightness of the skin over the assembly.

All i can think if is to try and measure the twist, and correct, prior to installing the spar - but this is very difficult due to how warped the skins are without the spar in place. Or just twist the nose skin assembly an arbritraty amount and cleco the spar back on and see what happens.

Anyone have this experience or have any advice?

Overall i am finding the ailerons very challenging - lots of problems so far. It's like they are from another model or something - nowhere near as clear instructions as the rest of the kit. I'm honestly a bit frustrated.
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  #2  
Old 11-06-2021, 12:08 AM
TASEsq TASEsq is offline
 
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Here is the pic of the skins wihtout the spar - banana like.

Edit: I have no idea why the photos are upside down, sorry! Probably because i am in Australia.
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  #3  
Old 11-06-2021, 11:51 AM
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wcalvert wcalvert is offline
 
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Location: Anacortes Wa
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Trent,

I've not built a 14, but my 7 had a similar issue on one aileron, something discovered after assembly. Another buddy is building an 8 and saw a similar result, a slight twist in the assembly once fully riveted.

I does seem that the skin drives the twist, and since everything is pre drilled, there's not much adjusting to do.

That being said, you'll likely find that the twist changes again after assembly, IMO because the final riveting and seating of the dimples moves the alignment once again.

On the good front, the errors seem to all dilute once you get the wing assembled and concern yourself with aligning trailing edges across the wing span.

This probably isn't what you wanted to hear, but hopefully my musings will illicit more comments from those more experienced than I ...
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  #4  
Old 11-06-2021, 01:19 PM
mc607 mc607 is offline
 
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Location: Canada
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I did mine earlier this summer and had the same issue. I clamped one end of the assembly onto my workbench with the spar flanges facing down and a spacer in the web so I didnít damage the spar. High density foam piece over l.e. skin before clamping. I put on a pair of mechanics gloves and twisted the opposite end of assembly. Took a couple good goes but got it very close. The final aileron was twistless. BTW, whenever I use the same method to check for twist (winding sticks??) I put them on the flanges, not the web. Sometimes the web will have a slight bulge and show a slight twist when there may not be one.
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  #5  
Old 11-06-2021, 09:56 PM
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HAL Pilot HAL Pilot is offline
 
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There are multiple threads to help on the wing and aileron twist at the WIKI

https://www.dropbox.com/sh/xu5p6f4l7...bU0ck0pJa?dl=0

Look for the RV-14 Wing 13-01 THRU 24-04.pdf
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  #6  
Old 11-07-2021, 01:21 AM
TASEsq TASEsq is offline
 
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Thank you - I religiously read all the threads for each chapter on your great wiki, but there were none in the aileron section that covered what I am seeing, as far as I can tell.
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  #7  
Old 11-07-2021, 05:32 AM
Mark Browning Mark Browning is offline
 
Join Date: Dec 2010
Location: Doncaster England
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I have built my 14 flaps and ailerons without any issue although this is my second RV slow build so i have some experience.

Building as per the instructions is important it will steer you out of trouble but thinking about what you are trying to achieve is also important
To prevent twist i used the same method as i did with my RV-7 rudder 12 years ago

Buy a length of steel box section and with a similar length spirit level
make sure its straight .... they usually are
Use the aileron skin and back drill it to the box section Cleakoing as you go
( you could use the other side of it for the flap )

keeping the skin on the box section will keep the whole thing from twisting
When it came to riveting the trailing edge i used some polyurethane sealer with on each side of the wedge and cleakoed every hole to the box section When it cured i went ahead and back riveted the trailing edge.

Checking again with the level after riveting gave me zero twist and no wavey trailing edge
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  #8  
Old 11-07-2021, 08:56 AM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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Quote:
Originally Posted by Mark Browning View Post
Buy a length of steel box section and with a similar length spirit level
make sure its straight .... they usually are
Use the aileron skin and back drill it to the box section Cleakoing as you go
( you could use the other side of it for the flap )

keeping the skin on the box section will keep the whole thing from twisting
When it came to riveting the trailing edge i used some polyurethane sealer with on each side of the wedge and cleakoed every hole to the box section When it cured i went ahead and back riveted the trailing edge.
Did you cleco the trailing edge to to the steel box or other area of the aileron/flap.
I have done similar method for the trailing edge of the rudder using angle instead of a box but it seems the concept is about the same.
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  #9  
Old 11-07-2021, 10:15 AM
mc607 mc607 is offline
 
Join Date: Apr 2014
Location: Canada
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Before you set blind rivets through spar in to nose ribs, remove the twist by shimming one of your cradles. Then set your blind rivets and check. Then check again as per step #7 page 22-08. Thatís where I had to apply a fair amount of force to fine tune it.
First picture is for Step 4
2nd picture is Back to back angles to hold T.E. true while proseal set up.
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  #10  
Old 11-07-2021, 11:01 AM
mc607 mc607 is offline
 
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Location: Canada
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You may want to twist a little extra in the opposite direction so when it relaxes it will comes back to true.
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