PZL SM-2
| PZL SM-2 | |
|---|---|
|
|
| Type: | Multipurpose helicopter |
| Design country: | |
| Manufacturer: | |
| First flight: |
November 18, 1959 |
| Commissioning: |
1961 |
| Number of pieces: |
85 |
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The PZL SM-2 Universal is a Polish multi-purpose helicopter .
history
It emerged in the late 1950s from the SM-1, a licensed version of the Soviet Mil Mi-1, and differed from it mainly in a modified cabin designed for four passengers. The engine, gearbox, main landing gear, stern thruster and the three-blade rotor were taken over from the SM-1.
The first prototype made its maiden flight in 1959 and was presented to the public in 1960. A year later, series production began in Świdnik . The SM-2 was used by the Polish Air Force for the transport of people and freight and as a medical helicopter with space for a stretcher and an accompanying doctor in the cabin and up to two people in the lateral outer gondolas. The transport version was equipped with a hydraulic crane with 120 kp and could therefore also be used for sea rescue . The range could be increased to 500 km with an external 140-liter additional container.
As early as the 1960s, the SM-2 was replaced by the Mil Mi-2 , which was also produced under license .
Some copies were exported to the ČSSR .
construction
The helicopter consists of a metal-clad tubular steel frame with ribs and longitudinal struts made of duralumin and the tail rotor carrier, also made of duralumin, which is constructed in half-shell construction . The rotor blades each consist of a tubular steel spar with wooden ribs and are planked with plywood and covered with fabric. The auxiliary rotor is driven by a shaft divided into seven sections with an intermediate and final angular gear. The three-legged chassis is rigid and has a large track width, whereby the two front wheels are designed to be rotatable. The LIT-3 engine used as drive is a license build of the Soviet AI-26W .
Military users
Technical specifications
| Parameter | Data |
|---|---|
| Manufacturer | Państwowe Zakłady Lotnicze |
| Year of construction (s) | 1959–? |
| crew | 1 pilot, up to 4 passengers |
| length | Hull 12.09 m, total 16.97 m |
| height | 3.30 m |
| Rotor circle diameter | Main rotor 14.30 m, tail rotor 2.50 m |
| Trunk width | 1.60 m 3.35 m with outside gondolas |
| Wheelbase | 3.10 |
| Landing gear track width | 3.27 m |
| Rotor area loading | 16.0 kg / m² |
| Power load | 4.4 kg / hp |
| Empty mass | 1,890 kg |
| Preparation mass | 1,934 kg |
| Payload | 320 kg |
| Takeoff mass | 2,550 kg |
| drive | an air-cooled seven-cylinder - radial engine LIT-3 (20.6 l capacity, compression 1: 6.4) |
| Starting power | 423 kW (575 hp) at 2200 rpm |
| Fuel supply | 240 l with additional tank 390 l |
| Top speed | 170 km / h |
| Cruising speed | 130 km / h |
| Climb performance | maximum 4.5 m / s |
| Service ceiling | practically 2,000 m maximum 4,000 m |
| Range | normal 320 km maximum 550 km |
literature
- Heinz A. F. Schmidt: Airplanes from all over the world . 3rd revised edition. Transpress, Berlin 1970, p. 132 .
- Heinz A. F. Schmidt: rotor planes . In: Aerotype . Transpress, Berlin 1968, p. 42/43 .
- Heinz A. F. Schmidt: Flieger-Jahrbuch 1966 . Transpress, Berlin 1965, p. 122 .
