Saturday, February 02, 2008

RTVed Inside Trailing Edges

Here's a step I almost forgot to do. It isn't mentioned in the aileron directions, but I read about it somewhere deep in the vans aircraft manual a year or two ago. Squeeze a dab of RTV inbetween the stiffeners, at the trailing edge, before you rivet the assembly shut. The RTV acts as a bonding agent for the upper and lower stiffners along w/ the trailing edge skin. This in return, will help prevent any cracking caused by aircraft vibration. -Note: proseal is also an acceptible substitute for the RTV and Yes, the rudder and elevators were done as well.
Update on RTV-
Re: What is RTV? Randall Henderson wrote:>Matronics> BTW, Vans did some research and testing a while back about the theoretical problems with RTV's being corrosive to aluminum as a result of the acetic acid base. Turns out the acetic acid is in there for the purpose of making the stuff self-etching, and is intended to "flash off" when it cures, so it shouldn't be corrosive to aluminum, beyond etching itself into the material on application. This was supported with tests in an environmental chamber. When the curing is complete the "ammonia" smell from the acetic acid is gone and the corrosion would cease. There are non-acid cure RTV's available, such as Permatex Ultra-Blue, which don't corrode at all. -

So Yes, I'm using the normal "ammonia" type RTV but, I have a two-part expoy primer sprayed in between parts, so in my book, all is well.

Here, the rib is riveted together. I used pop rivets on the last two holes, due to the fact that I could not get my squeezer into the constricted space.

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