RWD-14 Czapla
From Wikipedia, the free encyclopedia
| RWD-14b Czapla | |
|---|---|
 |
|
| Type | reconnaissance and liaison aircraft |
| Manufacturer | DWL, LWS |
| Maiden flight | 1935 |
| Introduced | 1939 |
| Primary users | Polish Air Force Romania |
| Produced | 1938-1939 |
| Number built | 3+65 |
The RWD-14 Czapla was a Polish observation, close reconnaissance and liaison aircraft, designed in the mid-1930s by the RWD team, and produced in the LWS factory from 1938.
Contents |
[edit] Design and development
The aircraft was designed in response to a Polish Air Force requirement of 1933 for a new army cooperation plane, a successor of the Lublin R-XIII. The RWD team of the DWL workshops (Doświadczalne Warsztaty Lotnicze) initially proposed the RWD-12 project, based on the RWD-8 trainer. It was however considered as not as good as the R-XIII, and another aircraft, the RWD-14 was designed by Stanislaw Rogalski and Jerzy Drzewiecki.
The first prototype was flown in late 1935. It won the contest over the Lublin R-XXI project and the Podlaska Wytwórnia Samolotów factory project, but factory trials showed that its performance was still not satisfactory. Between 1936 and 1937 two modified prototypes were built, designated RWD-14a, but both crashed during trials due to steering mechanism faults (the pilots survived). Finally, in early 1938 the fourth prototype, designated RWD-14b, was built. It was ordered by the Polish Air Force, receiving the name Czapla (Heron), but due to the long development process, it was regarded as only an interim model, to replace the R-XIII until the advent of the more modern LWS-3 Mewa. In return for refunding the development costs, the DWL gave the rights to produce the RWD-14b to the state factory LWS (Lubelska Wytwórnia Samolotów - Lublin Aircraft Works, a successor of the Plage i Laśkiewicz).
The LWS built a series of 65 RWD-14b Czapla by February 28, 1939 (they are sometimes called the LWS Czapla).
[edit] Operational history
The Czapla entered service in the Polish Air Force in the spring of 1939, equipping some observation squadrons (eskadra obserwacyjna). Due to its long development, it was not a modern aircraft, only a little better than the Lublin R-XIII. Its advantage was its short take-off (140 m) and landing (120 m), enabling it to operate from fields and meadows. Its modern successor, the LWS-3 Mewa, did not manage to enter operational units due to the war.
In the invasion of Poland in 1939, the Polish Air Force had 35 Czaplas in five observation squadrons (out of 12): No.'s 13, 23, 33, 53 and 63. Each squadron had seven aircraft. Squadrons were distributed among the field Armies. The remaining 30 Czaplas were in reserve (probably only four supplemented combat units during the campaign). Like the R-XIII, the Czapla was no match for any Luftwaffe fighter, bomber, or even reconnaissance aircraft, being much slower, and armed with only two machine guns. In spite of this, they were actively used for close reconnaissance and liaison tasks.
Most RWD-14b were destroyed during the campaign. About ten were withdrawn to Romania (there are quoted numbers from 10 to 16) and one probably to Hungary. They were taken over by the Romanian Air Force and used for auxiliary duties. No RWD-14b has survived.
[edit] Technical description
Mixed construction braced parasol high-wing monoplane, conventional in layout. A fuselage of a metal and wooden frame, covered with canvas. Wooden two-spar wings, canvas and plywood covered, fitted with slats. Wings were folding rearwards (width with foled wings: 3.9 m). Stabilizers of wooden construction. Conventional fixed landing gear, with a rear wheel. Crew of two, sitting in tandem in open cockpits, with twin controls and individual windshields. The observer had a 7.7 mm Vickers K machine gun, the pilot had a fixed 7.92 mm wz.33 machine gun with interrupter gear. 9 cylinder air-cooled radial engine PZL G-1620B Mors-II with 430 hp (320 kW) nominal power and 470 hp (350 kW) take-off power. Two-blade wooden propeller. Fuel tank 315 l in the fuselage. The aircraft could be fitted with radio and camera.
[edit] Operators
[edit] Specifications
General characteristics
- Crew: Two, pilot and observer
- Length: 9.00 m (29 ft 6 in)
- Wingspan: 11.90 m (39 ft 0 in)
- Height: 3.00 m (9 ft 10 in)
- Wing area: 22.00 m² (237 ft²)
- Empty weight: 1,225 kg (2,701 lb)
- Loaded weight: 1,700 kg (3,748 lb)
- Useful load: 475 kg (1,045 lb)
- Powerplant: 1× PZL G-1620B Mors-II air-cooled 9-cylinder radial, 350 kW (470 hp)
Performance
- Maximum speed: 247 km/h (133 knots, 153 mph)
- Cruise speed: 232 km/h (126 knots, 145 mph)
- Stall speed: <80 km/h (43 knots, 50 mph)
- Range: 675 km (364 nm, 421 miles)
- Service ceiling 5,100 m (16,728 ft)
- Rate of climb: 6.1 m/s (366 m/min) (1,200 ft/min)
- Wing loading: 77 kg/m² (16 lb/ft²)
Armament
- 1 × fixed, forward-firing 7.92 mm wz.33 machine gun
- 1 × flexible, rearward-firing 7.7 mm Vickers K machine gun for observer
[edit] References
- Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939" (Polish aviation constructions 1893-1939), WKiŁ, Warsaw 1977 (Polish language, no ISBN)
[edit] See also
Comparable aircraft
- Heinkel He 46
- Henschel Hs 126
- Breguet 270
- Potez 390
|
|||||
|
||||||||||||||
