| General Information | |
|---|---|
| Type | A-4 |
| Function | Observation |
| Year | 1933
1934 |
| Crew | 2 |
| Powerplant | |
| Type | Bessonov M-26 |
| Power at 0m | 300hp |
| Size | |
| Length (fuselage) | 6.5m |
| Length (full) | 7.2m |
| Height | 4.0m |
| Rotor Diameter | 13.0m |
| Rotor Area | 133.0m2 |
| Wingspan | 6.7m |
| Wing area | 6.2m2 |
| Weights and loads | |
| Empty | 1065kg |
| Loaded | 1365kg |
| Rotor load | 10.3 |
| Power load (kg/hp) | 4.55 |
| Speed | |
| Stall | 53km/h |
| Maximum | 176km/h |
| Maneuverability | |
| Turn time | 15sec |
| Roll | |
| Landing | 3...10m |
| Takeoff | 70...100m |
| Range | |
| Practical | 185km |
| Flight Endurance | 1.3h |
| Ceiling | |
| Maximum | 2000m (4100?) |
| Climb | |
| 1000m | min |
| Payload | |
| Fuel | ?kg |
A-4 (4-EA), TsAGI/ N.K.Skrzhinskij
 |
Winged autogiro, development of TsAGI 2-EA. Project started in May 1931. In the early 1932 MAI design group was created to assist TsAGI in blueprints and technical documentation. Aircraft was ready in September 1932. After careful ground tests, first flight took place on November 6.
Dual controls. Rotor was accelerated by the engine before takeoff.
Confidence in success was so high, that small series production started before the prototype was completed. Indeed, tests by NII VVS (A-4 was the first rotary aircraft tested there) (1933) were a complete success, and series build A-4's rolled out of factory (1934).
Special memorial sign was issued to celebrate creation of the A-4.
Thirteen were built at Kiev Plant N°43, and here the lack ends: autogiros were sent one-by-one to different military regiments. There were no pilots with any autogiro training - and all A-4s were crashed in a hasty attempts to fly them.
During Fall 1934 the A-4 was evaluated by the VMF, probably for shipborn role. This project failed to achieve any practical application - autogiros were still too primitive for advanced missions.
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