Kategorie:h3

Pescara F 3, France, 1923 , Helicopter 

Perrin, France, 1924 , Helicopter 

Avro Rota Mk I., United Kingdom, 1925 , Liason Autogiro 

Juan de la Cierva designed this autogiro, which was build in license by Avro on order of the Royal Air Force to check out this new concept.

Cierva CB 11, Spain, 1928 , Autogiro 

Cierva C 19 Autogiro, Spain, 1932 , Autogiro 

Cierva C 8 Autogiro, Spain, 1932 , Autogiro 

Cierva C 30, Spain, 1934 , Multi-purpose autogiro 

The C30 was a special flying machine, autogiros are a mixture between helicopters and fixed wing aircraft Some C30 were license-build at Avro for the RAF, known as the Rota.

Focke Wulf FW 61, Germany, 1934 , Helicopter 

Lioré et Olivier LeO C 302 Autogiro, France, 1936 , Autogiro 

Focke Achgelis FA 330 Bachstelze, Germany, 1938 , Unpowered rotary wing aircraft for use from submarines 

By the low height of submarines, the observation radius of subs was very limited. The Bachstelze should carry an observer into a better observation position, so the radius was greatly enhanced. The Bachstelze is without propulsion so it was dragged by the U-boat very much the same than today's paraglider being towed by boats at the beach. The Bachstelze's design allowed the crew to take her apart and stow it in the U-Boat. Every part was sized so it could pass the small hatches. A disadvantage was that when the U-Boot was attacked while the Bachstelze was outside, it's pilot and the apparatus was lost.

Nagler-Rolz NR 54, Germany, 1938 , Single seat ultralight helicopter 

Bruno Nagler and Frank Rolz designed this extreme light single-seat helicopter. To reduce weight, two small single-piston engines have been mounted on the rotor blades.