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Koolhoven F.K.56 Aircraft Information

Koolhoven F.K.56

Koolhoven F.K.56

National origin: Netherlands
Manufacturer: Koolhoven
First flight: 30 June 1938
Primary user: Netherlands Army
Number built: 31

The Koolhoven F.K.56 was a 1930s Dutch basic training monoplane designed and built by Koolhoven.

Development

The F.K.56 was a low-wing monoplane powered by a 450hp (336kW) Wright Whirlind R-975-E3 radial piston engine. Designed to be a basic trainer the F.K.56 had two seats in tandem for the instructor and pupil under fully enclosed canopy. The first prototype flew on 30 June 1938 and had a fixed conventional landing gear and a inverted gull wing. The second prototype had a retractable landing gear and a third prototype was fitted with a straight wing and dual controls.

Ten aircraft were ordered by the Netherlands Army based on the design of the third prototype. The ten, including the re-worked first and third prototypes, were all delivered before the German invasion of the Netherlands in May 1940.

Earlier in February 1940 the Belgians had ordered twenty F.K.56 basic trainers and seven had been delivered before the rest were destroyed in an air raid on the Waalhaven factory.

Operators

Belgium

Belgian Air Force

Netherlands

Specifications

Data from

General characteristics

Crew: 2
Length: 7.85 m (25 ft 9 in)
Wingspan: 11.50 m (37 ft 9 in)
Height: 2.30 m (7 ft 7 in)
Wing area: 20 m (220 sq ft)
Empty weight: 1,058 kg (2,332 lb)
Max takeoff weight: 1,600 kg (3,527 lb)
Powerplant: 1 x Wright Whirlind R-975-E3 Radial piston engine, 336 kW (451 hp)

Performance

Maximum speed: 300 km/h (190 mph; 160 kn) at a height of 500m (1640 ft)
Range: 800 km (497 mi; 432 nmi)
Service ceiling: 7,300 m (23,950 ft)

Bibliography

The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.

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