In September 1946, Bendix Helicopter sent an unsolicited proposal to the US Navy Bureau of Aeronautics for its Model J four place helicopter. The company was organized in 1943 as Helicopters, Inc., and in 1944 this was changed to Bendix Helicopter, Inc. The parent company was Bendix Corporation, founded by prolific inventor and industrialist Vincent H. [...]
On January 1, 1928, I. and J. Stiller, brothers and engineers living in Radom, Poland, filed a patent in Warsaw for a peculiar helicopter design featuring two small propellers fitted on the upper end of swiveling shafts arranged in parallel. These propellers were driven by an internal combustion engine located between the shafts. Means were [...]
The author stumbled across this drawing of the “Granville Racing Gyroplane” while reviewing NACA files at National Archives II in College Park, Maryland; it apparently originates from the February 1935 issue of Aero Digest magazine, a long defunct publication devoted to aeronautics news. The basic aircraft looks very similar to the the Gee Bee R-1/R-2 [...]
