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Wing Warping

Heres an idea to use wing warping on your WWI plane in effect using ailerons with less work involved.

The aluminium tubes replace the wing spars. Use 10mm diameter for about 2m spans and 6mm for smaller span models.

They are quite strong needing only a leading and trailing edge and leading edge riblets if required. The tube passes through all the ribs and riblets with a nice free turning fit and is glued/fixed to the end/tip rib.

If it is a biplane, interplane strut points should be provided on the appropriate ribs.

As the centre section of the wings are fixed to the fuselage a one piece wing is OK and can have dihedral built in. Where the tubes meet in the centre a small rod or tube inside the spar tubes allows them to move opposite to each other but must be a loose fit (dihedral) and a washer glued in the centre to stop it moving up either tube. The levers can be pinned/glued to the tubes for high or low wing as sketch.

As we don't need much down aileron but more up a differential setup is used (see sketch). Note that if a warp develops in a wing this can be adjusted out.

The trailing edge of most wings usually bows up or down so it helps to fit two small spars about 1" in front of the trailing edge. Covering has been known to warp many a wing.

This idea came from my uncle Alf ex RFC airman ground crew and was used on rubber powered models in the 1930s to obtain washout as they didn't have radio then.

Bob Lane