RWD 9
| RWD 9 | |
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| An RWD 9 during the wing folding contest at the 1934 Challenge. | |
| Role | Sport Aircraft |
| Manufacturer | DWL |
| Designer | Stanisław Rogalski and Jerzy Drzewiecki |
| First flight | 4 December 1933 |
| Introduction | 1934 |
| Primary users | Polish civilian aviation Czechoslovakia, Spain, France |
| Produced | 1933-1934 |
| Number built | 1 static test, 1 prototype, 8 production |
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The RWD 9 was a Polish sports plane of 1934, constructed by the RWD team.
Development
The aircraft was a further development of the RWD 6 - the winner of the IIIrd Challenge de Tourisme International Challenge 1932 international tourist aircraft contest. The RWD-9 was designed specially for the purpose of competing in the IVth Challenge de Tourisme International to be held in Warsaw during August–September 1934 . It was constructed by Stanisław Rogalski and Jerzy Drzewiecki of the RWD team in the DWL workshops in Warsaw. To meet new contest regulations, the new plane was designed as four-seater, with increased mass and engine power and yet better STOL capabilities.
The first prototype was completed in October 1933, with a 265 hp Menasco inline engine, and first flew on December 4, 1933. In January 1934 it was fitted with Czech Walter Bora radial engine (220 hp), and in spring 1934 with newly constructed Polish radial engine GR-760 (290 hp), created by Stanisław Nowkuński. In 1934 there were built 8 RWD 9s: 4 RWD 9W with Walter Bora engine (registrations: SP-DRA, SP-DRB, OK-AMC, OK-AMD) and 4 RWD 9S with GR-760 engine (registrations: SP-DRC, -DRD, -DRE, -DRF). RWD-9W had worse performance, comparing to RWD-9S (maximum speed 260 to 281 km/h).#
RWD 20
For research into Tri-cycle undercarriages D.W.L. converted the prototype RWD 9 to the RWD 20 fitting a 130 hp Walter Major engine, steerable noseleg, moving the main undercarriage legs rearwards, and removing the rear seats door and windows which were faired over with plywood. Extensive testing was carried out with take-offs, landings and taxiing on different surfaces including unprepared fields as well as ploughed land. Conversion was completed in 1938 and the flight trials proved the stability and manoeuvrability of the tri-cycle undercarriage during extensive taxiing trials, (landings and take-offs were carried out with the nosewheel steering locked). The fate of the RWD 20 is unknown but it did not survive WWII.[1]
Usage
Six RWD 9s were used by the Polish Challenge team, while the remaining two were ordered by the Czechoslovak team (OK-AMC, -AMD). The Czechoslovak OK-AMC was crashed during trainings, and had not been repaired before the contest.
In the Challenge 1934, held between August 28-September 16, 1934, Polish RWD 9S took the first (pilot Jerzy Bajan, SP-DRD) and second places (pilot Stanisław Płonczyński, SP-DRC). They won among others against German low-wing monoplanes Messerschmitt Bf 108 and Fieseler Fi 97. Polish RWD 9 took also the 7th and 15th places, and the Czechoslovak OK-AMD took the 8th place (pilot Jan Anderle).
After the Challenge, RWD 9 were used by the sporting aviation. In 1935 two of them (SP-DRA, -DRB) were sold to Spain, and the third SP-DRE to French institute Centre d'Essai in Villacoublay (markings: F-AKHE). On July 16, 1936, RWD 9 SP-DRC crashed to the Baltic sea due to low flying, killing crew, with Polish General Gustaw Orlicz-Dreszer aboard. The remaining two Polish RWD 9s were used in Polish Aero Club (SP-DRF was crashed later).
The Spanish aircraft were probably used as liaison aircraft on the Republican side during the Spanish Civil War.
Description
Four-seater sports and touring strutted high-wing monoplane of a mixed construction. A fuselage of a metal frame, covered with canvas on a wooden frame, in engine section with aluminium sheets. Two-spar rectangular wing of wooden construction, canvas and plywood covered. Wings were folding rearwards, and were equipped with automatic slats, flaps and interceptors. Closed cabin with four places in two rows, two front places fitted with double controls. The cabin had a pair of doors. Two-blade wooden propeller with a fixed pitch. Conventional fixed landing gear, with a rear skid. Fuel tanks in wings and fuselage - 160 l. Take-off: 76.1 m (to altitude 8 m), landing: 76.9 m (from altitude 8 m - best results from the Challenge contest).
Military operators
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- Spanish Air Force - Post civil war.
Specifications (RWD 9S)
General characteristics
- Crew: Two, pilot, mechanic
- Capacity: Two passengers
- Length: 7.6 m (24 ft 11 in)
- Wingspan: 11.64 m (38 ft 1 in)
- Height: 2.03 m (6 ft 8 in)
- Wing area: 16.00 m² (172 ft²)
- Empty weight: 560 kg (1,232 lb)
- Loaded weight: 790 kg (1,738 lb)
- Useful load: 370 kg (814 kg)
- Max. takeoff weight: 930 kg (1,860 lb)
- Powerplant: 1 × GR-760 air-cooled 9-cylinder radial engine, 216 kw (290 hp)
Performance
- Maximum speed: 281 km/h
- Cruise speed: 255 km/h (152 knots, 175 mph)
- Stall speed: <54.1 km/h (29 knots, 33 mph)
- Range: 800 km (432 nm, 497 mi)
- Service ceiling: 7,000 m (22,960 ft)
- Rate of climb: 6.1 m/s (1,200 ft/m)
- Wing loading: 58 kg/m² (max weight) (11.9 lb/ft²)
- Power/mass: 3.2 hp/kg ()
See also
- Related development
- Aircraft of comparable role, configuration and era
- Aero Ae.200
- Related lists
References
- ↑ Cynk, Jerzy B. 1971.
External links
Media related to RWD-9 at Wikimedia Commons
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