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  #1  
Old 05-13-2018, 06:56 PM
Pounder Pounder is offline
 
Join Date: Apr 2006
Location: Rochester Hills, MI
Posts: 178
Default Empennage

I suppose this info is already out there, but who is aware of a product (adhesive?) and application technique internal to rudder (and other empennage surfaces) to prevent oil canning or otherwise cracking?
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  #2  
Old 05-13-2018, 08:47 PM
Michael Henning Michael Henning is offline
 
Join Date: Jun 2011
Location: Nashua, NH
Posts: 486
Default

RTV silicone between the skin stiffeners by the trailing edge.
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  #3  
Old 05-16-2018, 05:43 PM
smokyray's Avatar
smokyray smokyray is offline
 
Join Date: Jan 2005
Location: TX32
Posts: 1,747
Default Hy-Sol

Quote:
Originally Posted by Pounder View Post
I suppose this info is already out there, but who is aware of a product (adhesive?) and application technique internal to rudder (and other empennage surfaces) to prevent oil canning or otherwise cracking?
Michael's technique works well.
Additionally:
Since I had .016 skins, I used Hy-Sol, a structural epoxy (used by Lancair and other composite/wood/metal builders to glue skins together) for additional strength and to fight cracking between rivets.
https://www.rshughes.com/p/Loctite-E...180516224238:s

I spread it thin between the stiffeners and skin prior to riveting. Working time is 40 min, cure 24hrs.
Excellent product, Grumman aircraft were assembled with a similar epoxy.
V/R
Smokey

PS:Side benefit is it holds everything in place and augments the rivets with impressive shear strength.

Last edited by smokyray : 05-16-2018 at 05:53 PM.
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