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  #1  
Old 09-03-2021, 01:07 AM
TASEsq TASEsq is offline
 
Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 351
Default Allowable flap twist

Well, my first (left) flap turned out great - as I riveted the bottom skin along the spar I checked the angles of the flap brackets as I went. They started out true and stayed that way.

However, the right flap is another story. It started out true but after the first round of rivets (every 10th one) it was about 0.2 degrees out of true. I checked after each round of rivets and it ended up 0.5 degrees out of true.

It seems an odd way of checking for no twist - I deburred the aft edges of the flap hinge brackets as a pair - did I induce a half a degree difference?

If there was a half a degree out of true on one flap - is this a lot? Iím hoping not.

Once the trailing edges are done etc I can use a laser to check them but canít think of a way at this stage that it would be helpful.
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  #2  
Old 09-03-2021, 04:12 AM
ShortSnorter ShortSnorter is offline
 
Join Date: Dec 2013
Location: NOLA
Posts: 349
Default

Another way to check is to mount them and ensure that the leading edge of the flap is fully against the rear spar. Then you look at the distance first row of rivets on the flap as compared to top wing skin.

Using this method - one of my flaps was off maybe 1/16" from the first rivet to the last and I have had no issues with a heavy wing.



****

Just read read the post - Save the above until the flaps are fully completed
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Last edited by ShortSnorter : 09-03-2021 at 04:16 AM.
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  #3  
Old 09-03-2021, 04:42 AM
Ron B. Ron B. is online now
 
Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
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I thought the reason for checking frequently was if there was twist, one would apply a little pressure to straighten out the twist , then apply a few more rivets and check. Repeat as necessary, not continue if there is twist. If continuing was the protocol then why bother checking, just finish and wait to see the results.
I'm no expert but that is what I've been doing.
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  #4  
Old 09-03-2021, 05:04 AM
TASEsq TASEsq is offline
 
Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 351
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I did try and remove the twist - removed all the clecos and twisted the flap. But I could not get it to come back no matter what I tried.
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  #5  
Old 09-03-2021, 07:26 PM
mc607 mc607 is offline
 
Join Date: Apr 2014
Location: Canada
Posts: 67
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When I did mine I put a four foot level tight against the bottom skin at each end of the flap and stood back and sited the edges of the two levels. I found that to work better than the plans method of checking for twist. Late now, but I always check the spar before starting. Iíve found the spars almost always have a bit of a twist. Tuning those up before assembly is always a good idea.
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  #6  
Old 09-03-2021, 11:27 PM
TASEsq TASEsq is offline
 
Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 351
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I tried the winding stick method and by eye they look fairly twist free to me?

Bit hard to translate into a photo.
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  #7  
Old 09-04-2021, 07:08 AM
KatanaPilot KatanaPilot is offline
 
Join Date: Feb 2015
Location: Locust Grove, GA
Posts: 736
Default RV-7 single data point

The RV-7A project I bought had quick build wings. The flaps had about 3 degrees of twist and Van's was fine with that.

I wasn't, so we built a new set. Spent a lot of time leveling the table, being careful during assembly and the new ones ended up at about 0.3 degrees. I thought that was nearly perfect.
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  #8  
Old 09-06-2021, 12:37 AM
TASEsq TASEsq is offline
 
Join Date: Aug 2017
Location: Melbourne, Australia
Posts: 351
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Quote:
Originally Posted by KatanaPilot View Post
The RV-7A project I bought had quick build wings. The flaps had about 3 degrees of twist and Van's was fine with that.

I wasn't, so we built a new set. Spent a lot of time leveling the table, being careful during assembly and the new ones ended up at about 0.3 degrees. I thought that was nearly perfect.
Thank you - that is good info. My TC also advised that i should ditch my digital level and build on - so will do so! Trailing edges next up.
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