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  #21  
Old 06-27-2022, 11:44 AM
clam clam is offline
 
Join Date: Oct 2005
Location: Lakeland, TN
Posts: 244
Default

I also ground the tip of the pin into a point to help it make the turns and not hang up on eyelet borders.
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  #22  
Old 06-27-2022, 07:05 PM
Outflyn Outflyn is offline
 
Join Date: Apr 2014
Location: Georgetown, KY
Posts: 3
Default Tip Rib to Aileron Stabilizer

I also used the hinge method to attach my wing tips on my -9A, but I also added small "L" brackets to the tip rib and the aileron bracket and added a bolt between them to prevent the wing tips from moving. It has worked well and I have no movement of the tips.

My build log is on the EAA Builders site: https://eaabuilderslog.org/?blproject&proj=7ZLY3oI53

Photos showing how I did the tips are under the Left Wing subfolder Left Tip entry: https://eaabuilderslog.org/?blprojec...cat=^left_wing

Not sure if you’ll be able to see the picture I’m trying to put here, if not hopefully the link will work.

https://eaabuilderslog.org/showmy.ph...f=IMG_9768.JPG

For the finial assembly I used a drilled bolt head and safety wired it to the bracket. The bolt is easily accessed in the gap area between the tip and the aileron.
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Mark Baty
RV-9A, N19RV (completed 2020)
Build Photo Log
https://eaabuilderslog.org/?blproject&proj=7ZLY3oI53

Last edited by Outflyn : 07-01-2022 at 01:10 PM.
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  #23  
Old 06-27-2022, 07:09 PM
Traash Traash is offline
 
Join Date: Apr 2007
Location: Montgomery, TX
Posts: 78
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Same problem here. My fix works well. Made a strap to connect the wing to the tip. Riveted to wing, screwed to tip.
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  #24  
Old 06-27-2022, 07:13 PM
Traash Traash is offline
 
Join Date: Apr 2007
Location: Montgomery, TX
Posts: 78
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  #25  
Old 06-28-2022, 03:49 AM
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SeanB SeanB is offline
 
Join Date: Dec 2006
Location: Colorado Springs
Posts: 664
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Thanks guys! I was also having similar thoughts to mechanically stop top movement. Your ideas and pics are very helpful! I appreciate it.
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  #26  
Old 06-28-2022, 10:48 AM
toolmanmike toolmanmike is offline
 
Join Date: Sep 2018
Location: Woodbury, PA
Posts: 16
Default why hinges

Guys, what is the purpose of the hinges in the wing tips? Why not nut plates and screws? Etc. Im not there yet, but am looking for good mods before I reach that phase.
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  #27  
Old 06-28-2022, 10:58 AM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 5,354
Default Hinges

Quote:
Originally Posted by toolmanmike View Post
Guys, what is the purpose of the hinges in the wing tips? Why not nut plates and screws? Etc. Im not there yet, but am looking for good mods before I reach that phase.
Makes R&R fast and easy. Just pull the pin.
I have a "how to", draft article on my blog.
https://wirejockrv7a.blogspot.com/p/wing-tips.html
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Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #28  
Old 06-28-2022, 11:45 AM
Stevea Stevea is offline
 
Join Date: Jun 2008
Location: San Jose, CA
Posts: 221
Default Hinges vs screws/nutplates

Quote:
Originally Posted by wirejock View Post
Makes R&R fast and easy. Just pull the pin.
OK, granted it may be slightly faster than me spinning out 45 #6 screws per wingtip using an electric drill.

OTOH, think I've had the wingtips off maybe 3 times since first flight. Once for paint, second time for a landing light upgrade, and third time to pull a new temp probe wire through the conduit. Other than needing to get in for landing/strobe/nav light access, there's no reason to pull the tips for any maintenance related job......at least on my airplane. Yours may be different.

Interestingly, the screws/nutplates addition to the wingtips is itself a change to the original plans. The 3/4/6 plans call for flush 1/8" pop rivets on the wingtips. Not sure about the later models.

Next time you see a T-34, take a look at the spar to leading edge connection. Held on with hinges and pins.....probably thicker hinges with larger pins than the ones being used for RV wingtips, but still pinned together. So, it does work to hold relatively important things together on a wing.
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  #29  
Old 06-28-2022, 01:15 PM
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erich weaver erich weaver is online now
 
Join Date: Aug 2006
Location: santa barbara, CA
Posts: 1,811
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I agree with above post. This mod is just not worth it. Wing tips very rarely come off and when they do itís a very quick job with power screwdriver.
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RV-7A
Santa Ynez, CA
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  #30  
Old 06-28-2022, 01:25 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,940
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Quote:
Originally Posted by erich weaver View Post
I agree with above post. This mod is just not worth it. Wing tips very rarely come off and when they do itís a very quick job with power screwdriver.
I agree that if the primary motivation is faster removal/installation, then this mod is not worth the effort. I have done the standard way and my latest plane has the hinge method. I did it primarily for the looks and I lucked out as mine has no movement.
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