Crew |
2 |
Dimensions |
Wing span, m |
11.40 |
Wing area, m² |
33.20 |
Length, m |
8.90 |
Powerplant |
1 × PE radial M-11D, power hp |
1 × 127 |
Weight, kg |
Empty weight |
849 |
Loaded weight |
1350 |
Performance |
Maximum speed, km/h |
144 |
Cruising speed, km/h |
126 |
Service range, km |
500 |
Service ceiling, m |
2500 |
Armament |
1 × 7.62-mm machine gun DT (DA) or ShKAS, bombs, kg
|
100 (4×25) |
The aircraft itself has been significantly improved. The ailerons and elevators of the Po-2M were equipped with aerodynamic compensation, as was done on the Po-2ShS; a trimmer was installed on the left elevator to reduce the load in flight, and the control cables in the tail section were hidden in the fuselage. The engine hood has been improved, the variable pitch propeller VISH-327 with a diameter of 2.5 m is equipped with a fairing spinner. To increase the flight range, an enlarged fuel tank with a capacity of about 200 liters, a GS-350 generator, and an RSI-4 transceiver radio station were installed on a single-float aircraft.
Armament included 100 kg of bombs - 4 FAB-25 on underwing holders and a DT machine gun on a pivot mount. A new NP-Po-2 night bomber sight, mounted on the starboard side, was used.
Powerplant. Subsequently, it was planned to install a more powerful M-11F engine of 150 hp. with air launch, but in its absence, M-11D 127 hp was installed.
During the tests, the aircraft performed 17 flights. According to its flight data, the aircraft, with an alignment of 31.7% of the MAR, did not have noticeable differences from the ground version of the Po-2VS. The longitudinal and lateral stability was assessed as sufficient, the stability on planing was good, the exit to the redan was easy and smooth, the water landing was soft. Takeoff and landing on water, according to the pilot, turned out to be easier than that of the land version. Thanks to the water rudder, the seaplane was well controlled on the water, at low gas the turning radius was 18-20 meters. When assessing seaworthiness, the testers allowed its subsequent operation with a wind wave of up to 0.5 m.
The longitudinal stability turned out to be somewhat worse than that of the wheeled Po-2, so in the future it was assumed to increase the area of the vertical tail.
Bibliography
- World of Aviation №1 2000 /Vladimir Ivanov, Andrey Korshunov, Vladimir Perov, Oleg Rastrenin/
- Polikarpov U-2: "Heavenly slug" /Mikhail Maslov/
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