Trim Tab drains

[cpirrmann]

Does anyone know if there is supposed to be drain holes in the trailing edge of the elevator trim tab for 1946 BC-12D? Or is the joint supposed to leak enough to let moisture drain out?
Thanks

[Robert Lees]

Re: Trim Tab drains

Is it metal or fabric-covered?
If metal, I have no drains in mine (the ends are open, adjacent to the hinge line.

Rob

[mulwyk]

Re: Trim Tab drains

I have both kinds. The metal ones are open on the ends, as Rob says. And are the superior design.

My project plane came with a wood trim tab. It had no drains at all. When I cut off the fabric, the wood structure inside simply fell out onto the floor..a soggy rotten mess.

A couple of seaplane grommets near the trailing edge of the tab might allow the wood inside to "breath" a bit and extend it's life...or they might cause control surface flutter. Dunno.

[cpirrmann]

Re: Trim Tab drains

Thanks for the info. Mine's metal, but any openings appear to be clogged with paint. I'll have to look more closely. Or it was fabricated and made improperly.

[Forrest Barber]

Re: Trim Tab drains

metal , no "drain" holes open on end is enough. The wood ones I ahve seen can be either way, if they are "sealed" no drain necessary, I agree it would be a good idea , is I can find the drawing I will check.