|Jerzy Drzewiecki and Jerzy Wędrychowski by the RWD 7|
|Manufacturer||Warsaw University of Technology workshops|
|First flight||July 1931|
|Primary user||Polish civilian aviation|
The RWD 7 was constructed by the RWD team of Stanisław Rogalski, Stanisław Wigura and Jerzy Drzewiecki in Warsaw. It was based upon their earlier designs, especially the RWD 2 and RWD 4. The RWD 7 was meant to be a record-beating plane, so it had a more powerful engine, while its mass was reduced. From its predecessors, it took the same fish-shaped fuselage without a direct view towards forward from the pilot's seat.
The only RWD 7 built (registration SP-AGH) was flown in July 1931 by its designer Jerzy Drzewiecki. On August 12, 1931, Drzewiecki and Jerzy Wędrychowski established an international FAI speed record of 178 km/h (111 mph) in the light touring plane class, (below 280 kg / 616 lb empty weight). On September 30, 1932, Drzewiecki and Antoni Kocjan set a height record of 6,023 m (19,755 ft). The RWD 7 was used in Warsaw Aero Club, among others, for aerobatics, then in 1936 it was bought by a known aviator Zbigniew Babiński for touring flights and used until 1938.
The RWD 7 was known for its extremely short take-off run: with a single crew member only 18 m (59 ft), with two crew members, 30 m (98 ft).
The RWD 7 was a wooden construction, conventional in layout, high-wing cantilever monoplane. The fuselage was rectangular in cross-section (narrowing in upper part), plywood-covered, apart from the engine section, which was aluminium sheet-covered. The wings were trapezoid, single-spar, single part, canvas and plywood covered. A crew of two was sitting in tandem, with a pilot in the rear cab. The crew cabs were open on upper sides, and had doors on the right side. The engine was 5-cylinder Armstrong Siddeley Genet II radial engine, 56 kW (75 hp) nominal power. Two-blade wooden propeller of a fixed pitch. The plane had a conventional landing gear, with a rear skid. A 30 l fuel tank was in central part of wing. A cruise fuel consumption was 18 l/hour.
Data from Glass, A. (1977), p. 299
- Crew: 1
- Capacity: 1
- Length: 9.8 m (32 ft 2 in)
- Wingspan: 6.3 m (20 ft 8 in)
- Height: 2.0 m (6 ft 7 in)
- Wing area: 13.60 m² (146 ft²)
- Empty weight: 246 kg (541 lb)
- Useful load: 194 kg ()
- Loaded weight: 440 kg (968 lb)
- Powerplant: 1 × Armstrong Siddeley Genet II air-cooled 5-cylinder radial engine, 75 hp (56 kW)
- Maximum speed: 186 km/h (116 mph)
- Cruise speed: 160 km/h
- Stall speed: 65 km/h ()
- Range: 260 km (163 miles)
- Service ceiling: 6,000 m (19,680 ft)
- Rate of climb: 6.2 m/s (1,220 ft/min)
- Wing loading: 32 kg/m² (6.6 lb/ft²)
- Power/mass: 0.23 kW/kg ()
- Take-off run: 18-30 m
- Related development
|Wikimedia Commons has media related to RWD-7.|
- Glass, A., op.cit., p.298-299
- Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939" (Polish aviation constructions 1893-1939), WKiŁ, Warsaw 1977 (Polish language, no ISBN)