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  #1  
Old 07-25-2015, 11:39 PM
BruceP BruceP is offline
 
Join Date: Feb 2007
Location: Bakersfield, CA
Posts: 220
Default Wing tip/aileron misalignment

So...the wing tips are on, the flaps and ailerons are rigged perfectly(used the W-930 aileron jig to verify)...and the wing tips are way off. Both are lower at the aft edge than the ailerons. The left one is 7/32's lower than the aileron,



and the right one is worse, 15/32's.



They look huge on these close-ups!

I'm assuming fairly major surgery is required to fix the wing tips, which I'm not sure I'm competent enough to tackle. Or maybe I just dread doing it. My question is...how much will this mismatch affect the flying characteristics if not fixed?
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  #2  
Old 07-26-2015, 04:59 AM
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rzbill rzbill is offline
 
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,726
Default

It looks like your wingtip mounting screws are already in so this first tip will not help you.
Maybe it will help others.

I drilled all my mounting holes #40 and then made the comparison you show. One of my tips was down. I pulled a rolling table with an automotive jack under the wingtip trailing edge and jacked it up to provide plenty of upward pressure. Then I re-drilled the mounting holes #30 before finishing to #6 flathead size. It came out perfect.

HERE is a link to that day in the shop

I understand from reading this site that some have split the trailing edge, jigged it to the correct position and epoxied the trailing edge back together. On the surface, it does not seem to be that much of a big deal to accomplish but I have never done it so YMMV.
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Last edited by rzbill : 07-26-2015 at 05:59 PM.
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  #3  
Old 07-26-2015, 09:22 AM
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flion flion is offline
 
Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,686
Default

I've always wondered if splitting the trailing edge as mentioned wouldn't put a twist into the tip. Anyway, even if you have installed the screws for the tips you can still take Bill's first advice. Lay up a strip of lightweight glass inside the tips under the screw holes. Then fill the holes with flox. Now you can reposition and redrill the tips. It's actually pretty easy as glass work goes; you just have to be patient twice while the resin sets.

To answer you other question, it really won't affect the flying characteristics that much. But after aligning everything except that, it will bother the heck out of YOU, so it would be worth your time to fix it.
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  #4  
Old 07-26-2015, 10:00 PM
nedricher nedricher is offline
 
Join Date: Jan 2013
Location: Peoria, AZ
Posts: 90
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My tips were both low as well. I did force them up prior to drilling--no help--they just sprung back down after clamp was removed after drilling. There was simply no (play) to allow them to move relative to the wing as they fit very tight to the end rib. I ended up spliting the rear of the tips along the trailing edge and re glued so they lined up with the aileron.
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  #5  
Old 07-27-2015, 07:08 AM
Rupester Rupester is offline
 
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Location: Mahomet, Illinois
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Quote:
Originally Posted by nedricher View Post
My tips were both low as well. .... I ended up splitting the rear of the tips along the trailing edge and re glued so they lined up with the aileron.
Yep, me too. I thought it was going to be a worse procedure than when I actually did it. Both my wingtips were off by 3/8" or slightly more. They corrected with no problem.
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  #6  
Old 07-27-2015, 12:03 PM
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PeteP PeteP is offline
 
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Location: Chesapeake, VA
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Default Wing tips

Vans will say it aint not big deal don't worry about it as it does not effect the flying. Personally couldnt stand it and preformed the wing tip surgery to make them line up.
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  #7  
Old 07-27-2015, 11:17 PM
BruceP BruceP is offline
 
Join Date: Feb 2007
Location: Bakersfield, CA
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Default

Thanks for the replies everybody.

At the time I did the tips I was more concerned about how they fit at the leading edge and they seemed to naturally position themselves well there. That pretty much dictated how the rest of the alignment went, at least for me. It seems that if I were to reposition and re-drill the holes I will not get the good positioning up front?

If I split the rear, would I have to reposition the ribs, particularly the W-916, or it would create a "ski jump" if I didn't?

Last question, anybody have photo documentation of splitting the rears?
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  #8  
Old 07-27-2015, 11:44 PM
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vlittle vlittle is offline
 
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Location: Victoria, Canada
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Line up the trailing edge to be colinear with the rigged aileron, drill, and then use whatever filler you require to adjust the leading edge fit.
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  #9  
Old 07-28-2015, 07:35 AM
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UnPossible UnPossible is offline
 
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Location: Granbury, TX
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Here's a pic of how I cut and reformed the trailing edge of my wingtips.... for cutting, I just used a cutting wheel in my Dremel tool.

Now they line up and all is good. This was just another of those steps that seemed a bit scary, but once started it wasn't a big deal to fix it.



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  #10  
Old 07-28-2015, 08:12 AM
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Raymo Raymo is offline
 
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Location: Richmond Hill, GA (KLHW)
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I've been tempted to fit my tips before the wings are installed but was warned by other builders to wait until ailerons and flaps are installed so they can be aligned properly. Seems they might still need some surgery even then.
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