RE: 1/3 Scale Halberstadt D.III
The lower wing is coming along. The photos show the sequence. The wing is constant chord but drooped at the trailing edge. The leading edge is straight. So the main spar has some droop, and the TE has the most. The shape of the TE also factors in some washout.
I built the wing in reverse order, starting with the shear webs! I glued together a strip of webs (cross grain), and using a pine board as a guide (cut to the shape of the curved spar), cut the strip of webs to the right height (curved). Then placed the webs between two pine formers and glued the top and bottom spars to the webs, clamping them to the pine. After the glue dried, I put the webs on the top side of the spars and removed the spar from between the pine formers. I originally planned on using one-piece spars top and bottom (3/8 thick) but I was afraid they would spring back to shape (webs would not hold the curve). So I resawed the spars to 3/16 thick, and glued them together (two-piece lamination for both top and bottom). I only used one strip from each resawed piece since I lost too much material from the bandsaw blade kerf. Fortunately I had extra stock.
Next I built some pine supports to hold the trailing edge and main spar in position while I glued ribs in place.