-8 wingtip reinforcement?

[V111Pilot]

Carl,

You are correct as I may have misspoken. The factory piece that is between the tip and wing is there but the rib is not. Going to try to order those tomorrow.

Hopefully that?s the solution

Thank you.

[RV8JD]

I think that should fix it.

Your post and picture got me curious about deformation of the wingtip in-flight since the wingtip skins are fairly flexible in places. I have the same wingtip with no extra reinforcements. Here are pics from the cockpit on the ground and in-flight at cruise speed. It looks like there may be a small amount of deformation (squeezing) in the aft 20% of the wingtip. It doesn't seem to affect the performance of my particular RV-8 though.

[DanH]

Originally Posted by V111Pilot

Random thought; has anyone considered using spray foam? .

Been there done that...bad juju.

[RV Wannabe]

So Brent and I are helping on the same RV-8.

The wing tip rib is missing on this build (each side). I guess the builder never installed them. Move the aileron out of the way and it is an open void in the wingtip. This is allowing the deformation. I was going to order the parts today.

Without having built, or having plans in hand I?m not sure what to order. W-412 one wing tip rib I?m relatively certain is missing. My question is do I need 2 of these one for left one right? Or is there a different part number? I imagine a different part # since I don?t believe they are symmetrical. The parts person at Vans didn?t know.

Thanks
Mark

[chaskuss]

Originally Posted by RV Wannabe

So Brent and I are helping on the same RV-8.

The wing tip rib is missing on this build (each side). I guess the builder never installed them. Move the aileron out of the way and it is an open void in the wingtip. This is allowing the deformation. I was going to order the parts today.

Without having built, or having plans in hand I?m not sure what to order. W-412 one wing tip rib I?m relatively certain is missing. My question is do I need 2 of these one for left one right? Or is there a different part number? I imagine a different part # since I don?t believe they are symmetrical. The parts person at Vans didn?t know.

Thanks
Mark

Mark,
You will need two of the W - 412 ribs. There is no left or right hand on these parts. Per Vans parts list Circa July of this year those ribs cost $9.80 each. Refer to drawings 9A and 17A for more information about the installation of these ribs. In particular note section G-G on drawing 17A.
Shoot me a private message if you need the drawings or any other information. Be sure to include your email address in the private message.

Charlie

[RV8JD]

Not sure if you have the plans or not, but you can purchase plans for the RV-8/8A on a USB drive from Van's using this link:

https://shop.vansaircraft.com/cgi-bi...oduct=fd_plans

In the meantime, here are the two drawings you need:

DWG 9A:

https://carln.smugmug.com/VAF/n-64ZFsZ/i-rqgmSqZ/A

DWG 17A:

https://carln.smugmug.com/VAF/n-64ZFsZ/i-3NhFSZh/A

Here are links to Pages 7-12 and 7-13 from the Construction Manual, "Wing Tip Installation":

https://carln.smugmug.com/VAF/n-64ZFsZ/i-fjmFQ8K/A

https://carln.smugmug.com/VAF/n-64ZFsZ/i-4QstJKB/A

[RV Wannabe]

This all helps a lot. 2 W-412’s on order.
Thanks guys.
Mark

Nice thing is this seems to be the most involved issue found so far.