de Bothezat helicopter

Although its four massive six-bladed rotors allowed the craft to fly successfully, it suffered from complexity, control difficulties, and high pilot workload, and was reportedly only capable of forward flight in a favorable wind.

Having written and lectured extensively on rotorcraft theory, de Bothezat received a contract from the United States Army in 1921 for the construction of an experimental helicopter[3] based on his own principles and those of his assistant Ivan Jerome.

[1] Establishing a workshop at McCook Field in Dayton, Ohio, and working almost entirely without models or wind tunnels for testing,[3] de Bothezat's helicopter was completed in December 1922.

[4] De Bothezat wanted to build an improved version of the craft,[5] but in 1924, the Army Air Service decided to terminate further work on the project, canceling the contract and ordering the helicopter to be scrapped.

[9] Although considered a failure by the Army on account of its complexity and unreliability, de Bothezat's difficult personality not helping his cause,[10] the "Flying Octopus" had still reached a significant level of achievement, and it would be over twenty years before an American helicopter would better the machine's performance.

Top view of de Bothezat helicopter as depicted in US Pat. 1,749,471.