To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

Koolhoven F.K.55

From Wikipedia, the free encyclopedia

Koolhoven FK-55 photo Le Pontential Aérien Mondial 1936.jpg
Role Fighter
National origin Netherlands
Manufacturer N.V. Koolhoven Vliegtugen
First flight 20 June 1938
Number built 1

The Koolhoven F.K.55 was a Dutch fighter prototype of the 1930s, which did not progress beyond the prototype stage.


Koolhoven FK 55 photo L'Aerophile December 1936
Koolhoven FK 55 photo L'Aerophile December 1936

Design on a Koolhoven high-performance aircraft first started late in 1937. The result, finished in early 1938 was the F.K.55, a single-seat fighter of radical design with contra-rotating propellers and an engine housed behind the pilot. It had initially been proposed to do away with ailerons on the wings, and replace them with "slot-spoilers" for lateral control, however this idea was abandoned early in the project.[1]

Of mixed metal and wood construction with wooden wings, the F.K.55's front fuselage was made of steel tube while wood formed the tail and rear fuselage. Its 640 kW (860 hp)Lorraine Pétrel engine afforded only just enough power to take off and to stay in flight. The production version would have used the more powerful (900 kW (1,200 hp)) Lorraine 12R Sterna engine but this never happened.[1]

Operational history

The aircraft flew for the first time on 30 June 1938. It flew for two minutes then landed. Underpowered, the FK.55 was cancelled in the same year.[1]


Data from [1]

General characteristics

  • Crew: 1
  • Length: 9.25 m (30 ft 4 in)
  • Wingspan: 9.60 m (31 ft 6 in)
  • Height: 2.60 m (8 ft 6 in)
  • Wing area: 16.00 m2 (172.23 sq ft)
  • Empty weight: 1,600 kg (3,527 lb)
  • Gross weight: 2,208 kg (5,026 lb)
  • Powerplant: 1 × Lorraine 12Hrs Pétrel V-12 , 640 kW (860 hp)


  • Maximum speed: 510 km/h (317 mph, 275 kn)
  • Cruise speed: 450 km/h (280 mph, 240 kn)
  • Range: 850 km (528 mi, 459 nmi)
  • Rate of climb: 13.1 m/s (2,580 ft/min)


  • 1 x 20 mm Madsen autocannon firing through the propellor
  • 4 x wing-mounted .303 machine guns


  1. ^ a b c d Green & Swanborough, pg 323
  • Green, William; Gordon Swanborough. The Complete Book of Fighters. Godalming, UK: Salamander Books. p. 415.
  • Shows 20 mm madsen cannon in hub.
This page was last edited on 22 November 2020, at 18:16
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.