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Koolhoven F.K.49 Aircraft Information

Koolhoven F.K.49


National origin: Netherlands
Manufacturer: Koolhoven
Designed by: Frederick Koolhoven
First flight: 1935
Primary user: Luchtvaart Afdeling
Number built: 4, plus 3 unfinished

The Koolhoven F.K.49 was a photographic survey aircraft built in the Netherlands in 1935. It was a high-wing cantilever monoplane of conventional design with twin engines carried in nacelles on the leading edges. Usually fitted with fixed, tailwheel undercarriage, a floatplane version was also developed. The aircraft carried an onboard darkroom.

Three examples were purchased by the Dutch Army, but only one of these was ever delivered, the other two were destroyed before completion when the Koolhoven factory was bombed by Germany on 10 May 1940. Others were purchased in small numbers by Turkey, Hungary, and Finland.

Operational history

The sole example delivered to the Dutch Army was eventually used as a general utility type, serving as an air ambulance, parachute trainer, and general transport. The Turkish F.K.49A, powered by Fairchild Ranger engines, had a short service life before the engines caught fire in flight, resulting in a fatal crash. The Finnish Coast Guard (Merivartiolaitos) ordered two examples with floats and powered by Hirth engines. The first of these was delivered via Sweden in 1940, and gave continuous engine trouble; it was withdrawn from service after only 18 hours of flight time, and the second one ordered was never delivered.


F.K.49A - enlarged version with Ranger engines for Turkish Air Force


Luchtvaart Afdeling (3 ordered, 1 delivered)
Finnish Coast Guard (2 ordered, 1 delivered)
HARITA Kitaati/Genel Komutanligi (Survey and Mapping Command) (1)
Turkish Air Force (1)


General characteristics

Crew: Two
Length: 11.70 m (38 ft 5 in)
Wingspan: 16.00 m (52 ft 6 in)
Height: 3.00 m (9 ft 10 in)
Wing area: 35.0 m (377 ft)
Empty weight: 1,330 kg (2,900 lb)
Gross weight: 2,120 kg (4,660 lb)
Powerplant: 2 x de Havilland Gipsy Major, 100 kW (130 hp) each


Maximum speed: 202 km/h (126 mph)
Range: 790 km (490 miles)
Service ceiling: 4,300 m (14,100 ft)

Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. pp. 561.
Den Ouden, Alex. "The aircraft designer Frederik (Frits) Koolhoven". http://www.alexdenouden.nl/artikelen/koolhoven06.htm. Retrieved 2008-09-11.
Koolhoven Aeroplanes Foundation
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Source: WikiPedia

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