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  #1  
Old 09-26-2022, 02:35 PM
rckcrlr rckcrlr is offline
 
Join Date: Nov 2020
Location: Vacaville
Posts: 7
Default badly aligned wing tip rv9

Please let me know if this isn't the right section to post this question...

Background

I bought an already built rv9 and have been going through fixing little odds and ends since purchasing. I have all the docs from vans and have spent a lot of time learning everything I can about how it's put together and enjoying every minute of it. In fact, I now want to build one myself...

To my question. The co-pilot side wingtip is WAY off in alignment with the ailerons and flaps. I've pulled the wingtip and verified that the ailerons and flaps are in the correct position using the wing rib tooling holes. The tip is not only 1/2 lower where the tip meets the ailerons but it also bends downward, meaning the far outside of the wingtip is signifacantly lower than the inside at the trailing edge. This discovery started when trying to diagnose a heavy left wing...

I've pulled the tip off which is attached using the vans method of small screws through the aluminum wing skin to nut plates attached to the inside of the wingtip on what looks like an aluminum strip. In order to straighten out the alignment I'll need to rotate the tip clockwise and remove some of the wing tip material on the top portion to fix downward bend. In order to do this I need to remove the aluminum strip with the nut plates attached and re-attach in the correct location after trimming the tip. It looks like the nut plates are riveted to the aluminum strip and not all the way through the wingtip so theoretically I could heat the aluminum strip and pull it away from the wingtip to remove.

I've gone back and forth on if I should just buy a new tip and start from scratch or try to heat and pull the nut plate strip off the existing one. Any advice would be very much appreciated.

FYI.. I've read a ton on the hinge attach method and decided I'll stick with the current method as it isn't that difficult to remove and attach.

Scott
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  #2  
Old 09-26-2022, 04:38 PM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,801
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Splitting the trailing edge and up a distance on the tip, and re-bonding is fairly common to fix the tips. I had to do that on my Aveo Ziptips, which was complicated by the trailing edge light.
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N164WM RV-6A Slider/O-360/FP Sold 4/2022
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  #3  
Old 09-26-2022, 04:39 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 5,052
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Iíd pull the strip, fill the countersunk holes with flox, and start over.
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  #4  
Old 09-26-2022, 05:17 PM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
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Quote:
Originally Posted by Kyle Boatright View Post
Iíd pull the strip, fill the countersunk holes with flox, and start over.
+1 here - go ahead and pull it off with whatever method works, fill the holes, and drill new ones as required for new install.

Splitting the tips and re-glassing them to achieve in-trail configuration is not unheard of. My right wingtip hangs about 1/4" low in cruise and it just has not (yet) been a big enough bother to do anything about. Mine is a "go-plane", not a show-plane. It looks mostly like an airplane but it's really a farm truck.
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Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #5  
Old 09-26-2022, 06:52 PM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,959
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Quote:
Originally Posted by Kyle Boatright View Post
I’d pull the strip, fill the countersunk holes with flox, and start over.
The wingtip shape is pretty much locked in unless you also remove or loosen off the W916 & W931 wing tip ribs too.

I'd remove the nutplate strips, flox in the old screw holes, & loosen at least one side of the W916 & W931 ribs & see if the wing tip can be shifted into a better position on the wing. With the tip taped or load strapped in place, I'd mark out the new screw holes for a new strip & nutplates. If necessary, I'd split the trailing edge to get best alignment. Finally, I would re-rivet the W931 rib, than the W916 in their new positions.
Yes, this should have some positive effect on the opposite heavy wing situation.
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  #6  
Old 09-26-2022, 07:10 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 2,424
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Pretty much agree with Greg, although I’m not sure if re-glassing the holes and re-drilling is necessary. If the wingtips fit on the wings without putting anything but a very small load for making it fit, I wouldn’t change that. Splitting the trailing edge tips to make them align with the properly jigged ailerons/flaps, is almost a completely normal thing to do. I’ve done that on half of the four RVs I’ve built. I just got lucky on two of them. The fix is relatively simple. Split the trailing edge of the wingtip with a cutoff wheel, dremel tool, jigsaw, sawsall (be careful), whatever but free it so that you can align it with your properly configured aileron trailing edge. May require some sanding on the inside of that cut line you just made. Align the new trailing edge of the newly split wingtip with your aileron, clamp it in that place, drill a couple #40 holes (or #30 - your choice), and clecoe it to hold it there. Then Schmutz up the interior of that split joint with an epoxy/flox mixture, put the clecoes back in to hold it , maybe add a couple layers of wetted cloth on the outside, and wait for it to cure. After cure, remove the clecoes and sand your result to flush in all dimensions. You’ll need to fill the clecoe holes and any unevenness with epoxy filler/micro……. then wait for your final paint job and gold Lindy because everything fits so perfectly.
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RV6/2001 built 2000/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019/sold2021
RV6/August 2022 build - Flying
Cincinnati, OH/KHAO
JAN2022

Last edited by Scott Hersha : 09-26-2022 at 07:14 PM.
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  #7  
Old 09-26-2022, 07:35 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 420
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The problem I had was that splitting the TE of the wingtip only lets you align the wing tip inboard end to the aileron. The outboard end of the wingtip TE doesn't move, so the alignment of the wing tip TE and the aileron TE may not be a straight line. It may not be too bad, but I had to cut the wingtip forward from the outboard TE about 18in to get the tip TE co-linear with the rest of the TE
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  #8  
Old 09-26-2022, 08:21 PM
rockwoodrv9 rockwoodrv9 is offline
 
Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 3,209
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I say split and cut it and see what you can do. Nothing to lose other than the fiberglass ich and you can learn how to do it.
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  #9  
Old 09-26-2022, 09:26 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
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Quote:
Originally Posted by Jake14 View Post
The problem I had was that splitting the TE of the wingtip only lets you align the wing tip inboard end to the aileron. The outboard end of the wingtip TE doesn't move, so the alignment of the wing tip TE and the aileron TE may not be a straight line. It may not be too bad, but I had to cut the wingtip forward from the outboard TE about 18in to get the tip TE co-linear with the rest of the TE
I donít understand why you canít align to the whole trailing edge wingtip. You split the whole TE of the fiberglass wingtip all the way out, and maybe a little way forward if needed, in fact it sounds like thatís what youíve done. If the outboard end of the wingtip doesnít align, then you need to do some more trimming. If your aileron jig aligns your ailerons, then that is your starting point. Make the tips align with that with trimming/fitting of the tips.
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RV6/2001 built 2000/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019/sold2021
RV6/August 2022 build - Flying
Cincinnati, OH/KHAO
JAN2022
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  #10  
Old 09-26-2022, 10:17 PM
rckcrlr rckcrlr is offline
 
Join Date: Nov 2020
Location: Vacaville
Posts: 7
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Thanks for all the feedback. The left side is about 1/4 inch off but itís in the same horizontal plane to the ailerons and flaps. I donít see how splitting the trailing edge will fix the entire problem on the right side. If you look down the trailing edge the tip trailing edge is at an angle going upward toward the aileron. Iíll get a couple pictures tomorrow.
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