Ace foam wing

Here’s the plan for building the balsa wing.

Ace RC used to produce foam wings which were used in a wide variety of plans published in magazines.  The idea was to build a cheap, easy plane without having to cut out ribs.  Quite a few of these planes became very popular.  Unfortunately the foam wings are no longer available, but you can still build these popular airplanes with a set of balsa ribs to make a wing with the same outline.

With this wing kit, you get 22 ribs and a dihedral brace.  Use 1/8 x 1/4 spars and 1/4 x 7/16 balsa leading edge.  Sheet the leading edge and trailing edge with 1/16″ balsa sheet, and add cap strips on the ribs between the spar and the trailing edge sheet.  For greater durability, sheet the entire wing with 1/16″.

If you prefer a wing with ailerons you can build the wing as shown and add flat 1/8 sheet ailerons.  Or you can trim the tails of the ribs, add a balsa trailing edge stick, and add a tapered aileron to replace the part you cut off.