Category:Launoy et Bienvenu Hélices contra-rotatives
On April 26, 1784, the Frenchmen Launoy and Bienvenu flew a very simple, small model in front of the Royal Academy of Sciences. It was powered by an arc spring mechanism that drove two counter-rotating propellers shaped like bird feathers. However, the rise of hot air balloons completely overshadowed this invention, which fell into oblivion.
This page lists all films that feature a variation of the Launoy et Bienvenu Hélices contra-rotatives.
See also
Pages in category "Launoy et Bienvenu Hélices contra-rotatives"
The following 2 pages are in this category, out of 2 total.