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Wing tip question

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woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Wed Mar 05, 2014 10:54 am Post subject: Wing tip question

My project is in the paint shop.  In a previous thread I discussed the pros/cons of not drilling out the wingtip attach holes until after paint when I will have the flaps and ailerons all installed.



My new question is this though.  There is the w-1016 wingtip support that seals off the aft section of the tip.  I haven't drilled that out yet either but I can do before those parts get painted and then not have to touch up the paint afterwards, but I was wondering about how much that part needs to be mated up to the aileron or how much distortion play in can inflict on that section of the tip.  Another thought I had was to not drill/rivet it out now and rather instead of even drilling it out later, just to epoxy/cement/seal it in place after paint.



Any comments/suggestions appreciated.

_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

carl.froehlich(at)verizon
Guest

Posted: Wed Mar 05, 2014 12:01 pm Post subject: Wing tip question

As you note, wingtip rigging needs to be done last - fit the wings, then

flaps, then ailerons, then wingtips.  The trailing edge of the wingtip can

move up or down a good half inch - thus you need to know where it goes

before you drill the mounting holes or wingtip rib.  If not rigged properly

you can easily end up with the wingtip acting as an aileron - and since it

is as far out as it can go a small variance can create a large moment arm.



To be blunt, this should have been done during initial wing fit up, then

everything taken off for paint.  As you have gone to paint without a wing

and control surface fit up I see only one path forward that does not mess up

the final paint.  You paint everything but the wingtips, assemble and rig

the wings, flaps and ailerons, fit the wingtips then take the wingtips back

for paint.  Many people do some glass work on the wingtips after the rib is

installed as well.



Carl



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bill.peyton

Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO

Posted: Wed Mar 05, 2014 1:38 pm Post subject: Re: Wing tip question

I agree with Carl.  The wingtips should have been fit prior to paint.  I had to separate and re-glass the rear half of one of the tips to get it in alignment properly. There is no reason that this can't be done with the wing  off of the plane, but you will need to install both the flaps and the ailerons to properly align the tip.  The W-1016 should also be installed.  Only then should the tips be painted.

_________________
Bill
WA0SYV
Aviation Partners, LLC

woxofswa

Joined: 12 Aug 2008
Posts: 349
Location: AZ

Posted: Wed Mar 05, 2014 2:15 pm Post subject: Re: Wing tip question

I understand where you guys are coming from and appreciate the inputs. 

In my case the paint shop is 50 yards from my hangar and since tips are Matterhorn  white only, the painter says we can do them anytime. 



My goal on installation and rigging was to do it just once with virgin hardware with each piece at it's final weight. Obviously if the paint shop location were different I would have made other plans.

_________________
Myron Nelson
Mesa, AZ
Flew May 10 2014

dmaib@me.com

Joined: 25 Apr 2006
Posts: 454
Location: New Smyrna Beach, Florida

Posted: Wed Mar 05, 2014 6:51 pm Post subject: Re: Wing tip question

This is one of those questions that seems to come up every year or two. In my opinion, it is one of the areas where following Van's instructions carefully is the right way to go. My wife and I followed the instructions very carefully and ended up with wingtips perfectly matched to the ailerons. Between us, we had almost zero experience with these kinds of things. Maybe we were just lucky, but I think this is one of those areas where deciding to do it differently might increase the possibility of mis-aligned wing tips/ailerons. Their are some areas where some of the smart people on these forums have figured out a better mousetrap, and I have been the beneficiary of more than a few of those. But, I don't believe wingtips are one of those.

_________________
David Maib
RV-10 #40559
New Smyrna Beach, FL

Rocketman1988

Joined: 21 Jun 2012
Posts: 63

Posted: Thu Mar 06, 2014 1:31 pm Post subject: Re: Wing tip question

Yeah, not so sure about following the plans on the wingtip alignment.  When you get to the wingtip section, hang the flap and aileron on that wing, align them, then fit the wingtip.  If you just put the wingtip on and keep it as tight to the skin flange as you can, YOU MAY BE UNHAPPY with the result.  And the TE of the wingtip can move 11/16"...ask me how I know  



Luckily, I had only drilled a few holes and I had been reading the forums on this issue, so I went back and hung the flap and aileron, then aligned them in the specified position.  Turns out that the wingtip was "off" by about 1/2 of a hole diameter at the LE...yep, 1/16".  Sure glad I checked it before drilling the final hole size...Looks good now, within 3/32" tip/aileron/flap...

Rocketman1988

Joined: 21 Jun 2012
Posts: 63

Posted: Thu Mar 06, 2014 1:34 pm Post subject: Re: Wing tip question

I should add that I followed the plans exactly on this first tip and must have gotten lucky because it matched the flap/aileron when finished...



Did the same on the second tip and, well, that's the post above...

dmaib@me.com

Joined: 25 Apr 2006
Posts: 454
Location: New Smyrna Beach, Florida

Posted: Thu Mar 06, 2014 2:15 pm Post subject: Re: Wing tip question

I do remember that it was a two person job to make sure the wingtip was pushed securely into position and held very firmly in position while the holes were drilled. IIRC it really needs to be pushed forward with some force to fit the leading edge properly. This was done while the wings were still in the cradles.

_________________
David Maib
RV-10 #40559
New Smyrna Beach, FL

Ron B.

Joined: 17 Feb 2009
Posts: 103
Location: Nova Scotia

Posted: Thu Mar 06, 2014 6:33 pm Post subject: Re: Wing tip question

The RV-14 plans have you use a ratchet strap to pull the wing tip down into the wing at the leading edge. Works well and the wing tips are the same tip supplied with the RV-10. I had no problem doing this installation by myself with the straps.

Ron

Rocketman1988

Joined: 21 Jun 2012
Posts: 63

Posted: Thu Mar 06, 2014 8:21 pm Post subject: Re: Wing tip question

Yeah, pushing the wingtip as tight as possible into the leading edge was what generated the 11/16" difference at the TE, in my case...

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