Wing Posts

From: calgoddard <calgoddard_at_yahoo.com>
Date: Tue, 07 Jun 2011 00:08:24 -0000

A continuing problem I have with some of my planes, e.g. a Cezar Banks LPP, is that the wash-in disappears or, in extreme cases, changes to wash-out as I adjust the forward wing post up or down to change the incidence of the main wing during trimming.

I use tissue tubes glued to the motor stick as sockets for the wing posts. I know this arrangement is standard.

All I can figure is that my wing posts are not perfectly perpendicular to the spars.

Or maybe the wing post sockets are not perfectly aligned? Perhaps I need to use jigs to align the tissue tubes when they are glued to the motor stick.

I typically glue on the front wing post and the back wing post using a jig or the edge of the building board to get the posts parallel to each other and perpendicular to the wing spars.

I then glue in the forward diagonal brace. I then insert the wing posts in the tissue tubes that are connected to the motor stick. I then glue in the rear diagonal brace to get the right amount of wash in. I would appreciate any advice on this issue.
Received on Mon Jun 06 2011 - 17:08:28 CEST