A software that make a presentation to an autogiro model Cierva C30. This with 2D- and 3D-images, and text both in English and Swedish. It can be downloaded for PC (Linux, Windows), or as an app for Android. HERE.
JUAN de la CIERVA
Juan was from Spain, and the inventor of the Autogiro. Before WW1 was he a builder of gliders, and working on how to prevent planes going into stall. 3 prototypes of autogiros was constructed during 1922. The fourth (Januari 1923) became the first to reach the air. First versions had stiff rotor-blades, which moved faster against the wind. When in work the rotor then start to shake and become very instable. To solve this was the blades allowed to move a little. The rotor will then self-adjust in the air.
A new model (C5) became the last build in Spain. For financial and production reasons, moved he then to England. Together with Avro build he then C6A. The autogiros body came from an Avro 504. Rolf von Bahrs first autogiro was an C19. It had wings and where controlled by rudders, as an ordinary plane. SE-AEA was of a later type (C30), introduced in 1933. The steering are from now, just by tilting the rotor.
Cierva died in an flying-accident 1936. This during take-off with an DC-2. He ended his life in an ordinary aeroplane, although much of his work with autogiros ment to make flying safer.
ROLF von BAHR
Rolf was born 1912 in Stockholm. His father became attaché (Swedish Navy) in the UK. Some of his schooldays where therefore spent there. Years later where Rolf back in England, to become an pilot at Heston Airport. At the same place performed Cierva tests on his autogiros. Had Rolf knowledge of this before he arrived?. The airship Graf Zeppelin visited the airstrip, and here commander Dr. Eckener where very positive regarding autogiros. A mere chance or not, it may have changed this history.
When Rolf returned home, he started with the Dieden brothers, AB Autogiroflyg. The first own autogiro was an C19 (SE-ADU). 1934 followed SE-AEA, at the same time became he the single owner of the company. Through the years where he then working for both civil and military costumers. Work as reconnaissance on u-boats, mines, icebound ships. Also aerial photo, conveyance of patients and flying skiers up to the top of the slope.
At the most had Rolf 7 autogiros. With 7-8000 hour in the air, became he the no.1 autogiro-pilot. He was also present at Croydon when Cierva died. He left the rest of us in 1988.
Type: Cierva C30 (Avro Rota).
Diameter of rotor: 11.28 m.
Length (body): 6.01 m.
Weight (loaded): 862 kg.
Crusing speed: 129 km/t.
Max speed (ligthly loaded): 177 km/t.
Service ceiling: 2400 m.
Range: 402 km.
Engine: Armstrong Siddeley Genet Major, 7 cyl. radial, 145 hp.
The hanging control column does all the steering, while airborne. This by tilting the rotor. The rotor can before flight be spun up to 175-200 rpm. For this purpose will a shaft with a quick-release, for a short moment, connect the rotor with the engine. This will shorten the take off run. The tailplane has positive aerofoil camber on starboard side, and the opposite on port. This counteracts the torque of the rotor, when flying forward. The tailwheel are steerable by rudder pedals.
©Jan Lindström 2018-2020