The Bleriot 137 military airplane (French) : a twin-engine multiplace monoplane (1932)
NASA Technical Reports Server (NTRS) · leaf 8
n of wing, rib covers the space between a main flanges; c,braces; g, gussets by heavy lines. '^l- *ube holding Ni, B and B are joined by a fishplate* Fig.9 Evolution of the profile along the span. Fig.7 Vertical end and side views of spar. A, openwork web whose vertical parts are reinforced by… … Fig.13 Aileron. Note U at rear edge, in which pivots the balancing flap shown in Fig.33. Taken from LlAeronouticfUB
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.