ZAGI A-4
| ZAGI-4 (4-EA) | |
|---|---|
|
|
| Type: | Gyroplane |
| Design country: | |
| Manufacturer: | |
| First flight: |
November 6, 1932 |
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ZAGI A-4 (also ZAGI 4-EA , Russian ЦАГИ А-4 or 4-ЄА) was a Soviet gyroplane from the 1930s.
development
Alexei Tscherjomuchin , head of a 1930 established special department of the ZAGI for the construction of supporting and helicopters , designed the A-4 due to a corresponding demand of the head office of the aviation industry at the beginning had 1932 experience with the construction of gyroplanes it before with the 2-EA , that he developed together with Iwan Bratuchin .
The A-4 had braced stub wings in a low wing arrangement with the wing tips bent upwards. The construction consisted of welded steel tubes with dural planking on the bow and fabric covering on the rest of the hull. The gyroplane was designed as a two-seater with double controls so that it could be used for training purposes with special units of the Soviet air forces . The rotor attached above the fuselage was moved by a gearbox. For this purpose, the 220 kW M-26 motor used delivered around 11 kW of its power, most of which it transferred to the propeller at the bow. The landing gear was braced and not retractable. There was a grinding spur at the stern .
The prototype first flew on November 6, 1932. At the same time, the construction of a small series had already started, the first of which flew on November 30, 1932.
Technical specifications
| Parameter | Data |
|---|---|
| Manufacturer | ZAGI |
| constructor | Alexei Cheryomukhin |
| crew | 2 |
| Rotor circle diameter | 13 m |
| Rotor speed | 156 rpm |
| span | 6.73 m without rotor |
| length | 7.22 m without rotor |
| height | 4.12 m |
| Wing area | 6.2 m² |
| Empty mass | 1065 kg |
| Takeoff mass | 1365 kg |
| drive | an air-cooled radial engine M-26 |
| Starting power | 300 PS (approx. 220 kW) |
| Top speed | 176 km / h |
| Minimum speed | 50 km / h |
| Duration of a full circle | 15 s |
| Rise time | 21 min at 3000 m altitude |
| Summit height | 4100 m |
| Range | 185 km |
| Take-off / landing route | 70-100 m / 3-10 m |
literature
- Vladimir B. Kazakov: perpendicular to the sky . In: Aviator Calendar of the GDR 1989 . ISBN 3-327-00520-6 .
- G. L .: Who? When? What? In: Fliegerrevue . No. 9/355 , 1982, pp. 428 .