ho trovato anche questo documento
e nella parte in inglese dove parla delle ali ecc.. (
http://www.rcgroups.com/forums/showa...2&d=1321539638)
trovo che parla di questa foam:
The wing templates provide a basis for construction back to the hinge line only.
I made two additional small templates to generate the foam cores necessary to build the center areas between the ailerons and between the flaps. The main cores were first joined in the center, the 1/4 x 3/4 balsa spar that establishes the hinge line glued in place and then the bearing blocks and trailing edge cores were fitted to their proper positions.