Category: Wings

We mounted the two vertical C shaped channels behind the aileron bell crank assembly.  There are little right angle peices that connect these channels to the skin.  All this extra structure is to stiffen the rib where the bell crank is.  The plans show to make the top face of the angle peices flush with the curvature of the rib flange, since both are riveted tot eh skin.  This took me more time than I thought it might because the rib flanges are not perfectly square, some are a little over bent, so it is hard to tell where to mount this angle bracket vertically.  Dan had a good solution to clamp a long piece of aluminum angle extrusion to several ribs on  either side of the bell crank rib.  The angle extrusion is stiff enough that it won’t bend so it will lay like the final skin on the ribs.  With the extrusion on the ribs, I could see the gap of the over bent rib flange, and mate the angle bracket to the under side of the extursion.  We think when the skin is riveted on it will pull the rib flange up a little.  Once we had the top ones done we moved the extrusion to the bottom as can be seen here :

Celco-ed Bell Crank Brackets:

We took the wing structure apart do deburr the parts for priming.

Return To Ailerons – Wings

Dan assembled the aileron bell cranks.  The bushing holes in the angle brackets were matched drilled, in the drill press, a little under and reamed to final size.  In case you don’t know bronze bushing are designed to be press fit onto bores but this casues the inner diameter to collapses a tiny bit.  We could just start the bronze bushing in by hand until it stopped.  We then checked the fit of the rotating steel bushing.  Dan polished the outside of teh steel bushing on the Scotchbrite wheel.  We thought it was good so used the arbor press to insert the bronze bushings.  There is a peice of phenolic to space the angle brackets.  We had to use a shim of paper on either side of the phenolic to get the rught feel.  (I would really prefer ball bearings  but given the limited motion of the bell branks this seems like a good design, but we both wanted a good smooth feel the rotation.)

For some reason our aluminum angle has a big inside radius so the head of the angle clamp bolt and the nut did not sit flat.  We machine a little spot face so they sit properly.  We will sand this area really smooth.

Return To Wings – Ailerons

We have been working on the Aileron Bell Crank parts.  Used the scan/print spray glue method for the parts that had make to print size on them.  After the root rib trim episode we looked at the how these parts are assembled.  For example the U channel parts are stiffeners on the rib behind the bell crank assembly.  The length should be accurate but it is position so there is clearance between the end and the skins.  So there is no need to be right on the 1/64 dimension, which might save a little time for making four parts.

Return To Wings – Ailerons