Odd Birds

[kolibri282]

XXavier was so kind as to post a link to a real treasure trove
https://www.rotaryforum.com/forum/rotorcraft/technical-papers-books-and-publications/1139020-l-aérophile-what-is-a-turn


this nice picture shows two aircraft of the 30s:
https://gallica.bnf.fr/ark:/12148/btv1b9027511j.r=Autogire?rk=21459;2

Enjoy!

 

[WaspAir]

Wonderful pictures. Thanks to both of you.