Good afternoon! Thanks Eswube for your feedback!
with the early 1930s, the design of aircraft changed dramatically. From airplanes built with wood, canvas and piano strings, we saw a swift evolution. A witness of this change was Wibault´s prototype for AdA´s 1931 fighter contestest:
Wibault 313 was an all metal aircraft, with wings in cantilever without bracings or strings, a stressed Al alloy skin (canvas only over the control surfaces), a relativelly powerful Gnome & Rhone radial engine, but with fixed landing wheels and open cockpit.
In the late 1920s, and during all the 1930s, the main aircraft beteween Metropolitan Frances and the Levant and North African colonies was the seaplane. One example of these was the LeO 242 tetramotor monoplane of the late part of this period.
The changes were also seen in civil airplanes, from rather ugly angular models, to all metal models with much more refined aerodynamics. The evolution is clearly seen in the progression between the Wibault-Penhoet trimotor, and the nice Dewotine trimotor of the years inmidiately before the eruption of WWII.
Cheers!