Wingtips move, hinge method

[johnbright]

I haven’t done it yet but looks like good info here: https://vansairforce.net/community/s...d.php?t=133761

And post 6 of that thread has this link: http://www.rvplane.com/?categoryid=3&dayid=567

Post 18 reiterates how to hide the hinge eyelet gaps.

Some in the thread speak of 1/8” play at the trailing edge. I assume they mean vertically.
.

[wirejock]

I just thought of something.
Is it possible the movement isn't due to the hinge?
Maybe it's because the wingtips are so flexible. Some builders stiffen the open areas top and bottom with various materials. I used 1/4" dowels. Two top and two bottom.
Just a thought.

[SeanB]

Hi Larry,

I was also questioning the flexibility in the tips. But, I installed two upper and two lower stiffeners per tip. Foam, faired micro, then two layers of 9 oz. cloth to encapsulate. Made the oil canning go away very well. Same movement persists on aft tip though. When I lift the aft wingtip, I can see the movement uniformly going forward along the upper rivet line. This makes me think it is the spacing between eyelets, once more.

I wonder if Mark and Joe’s methods to arrest hinge movement includes installation of stiffeners or not. This could lend answers toward wingtip flexibility being a contributing factor.

[Outflyn]

I used the hinge attach method 1) because I think it makes for a much cleaner look and 2) to make removal quick and easy. I also added stiffener strips inside the tips.

Here’s a picture of my tip to wing fit up.
https://eaabuilderslog.org/showmy.ph...E25A0EF23.jpeg

[SeanB]

Mark….beautiful! That’s what I’m shooting for with mine.

[SeanB]

I decided to give Joe’s idea of a hinge spanner bracket a try. I elected to install mine near the aft part of the bottom hinge. Keeps the fasteners “hidden”, but not as easy to access. Also, I can see this location being overlooked while removing a wingtip and maybe causing damage when pins are removed. I definitely notice a difference on the right tip, that had the most movement. If it was a 1/4” movement before, it may be 1/16” now. Happy for that. Again…thanks everyone for your ideas of various solutions. Way too much time on the wingtips. Time to move on to the next bout of fiberglass fun…the empennage fairing!