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Koolhoven F.K.40 Aircraft Information

Koolhoven F.K.40


National origin: Netherlands
Manufacturer: Koolhoven
Designed by: Frederick Koolhoven
First flight: 1928
Primary user: KLM
Number built: 1

The Koolhoven F.K.40 was a small airliner built in the Netherlands in 1928 for KLM. It was a conventional high-wing cantilever monoplane with enclosed seating for up to six passengers and powered by a single engine in the nose. The fuselage was of welded steel tube construction with a wooden wing skinned in plywood held in place by four bolts to facilitate removal. The cabin was spacious for an aircraft of its size, and was intended to be readily reconfigured for passengers, mail, or freight. Although up to six seats could be fitted, the only F.K.40 built flew with four.

This aircraft, registered PH-AES and nicknamed Piet Haas ("Peter Hare"), was operated by KLM until it was sold into private hands in 1936. Shortly thereafter, it was sold to the Spanish Nationalist Army, and was operated as an air ambulance during the Spanish Civil War.


General characteristics

Crew: Two pilots
Capacity: 4-6 passengers
Length: 11.50 m (37 ft 9 in)
Wingspan: 14.50 m (47 ft 7 in)
Empty weight: 1,520 kg (3,340 lb)
Gross weight: 1,900 kg (4,180 lb)
Powerplant: 1 x Gnome-Rhone Titan, 170 kW (230 hp)


Maximum speed: 185 km/h (115 mph)
Service ceiling: 3,800 m (12,500 ft)
Rate of climb: 1.7 m/s (335 ft/min)

Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. pp. 561.
- 0211.html "The Koolhoven F.K.40". Flight: 203. 14 January 1930. http://www.flightglobal.com/pdfarchive/view/1930/untitled0 - 0211.html. Retrieved 2008-09-12.
Den Ouden, Alex. "The aircraft designer Frederik (Frits) Koolhoven". http://www.alexdenouden.nl/artikelen/koolhoven04.htm. Retrieved 2008-09-12.
Koolhoven Aeroplanes Foundation

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