- Joined
- 25 June 2009
- Messages
- 13,947
- Reaction score
- 3,647
In 1935, inventor Glenn Dale was granted two patents the same day: one for the whirligig/airplane design (US1981441) and the other one for a pure helicopter with 16 sets of rotors and 64 blades (US1981442)!
Here is the so-called "Flying Whirligig"...
Here is the so-called "Flying Whirligig"...