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Klaas Willem Jonker
(Wilko)
† April 30, 2018

On Monday 30 April 2018, Wilko Jonker died after a long illness at the age of 58. He leaves behind a wife and two children. The Dutch military aviation and plastic modeling were his hobby and on this website he shared all the knowledge he has collected over the years. His hobby has been able to distract him from the persistent disease in his body until the last week of his life. The contacts with other hobbyists were a major support for him.

This website will be maintained by different people for as long as possible, so that other enthusiasts can continue to benefit from extensive content.

Koolhoven FK.31

Published: Friday, 12 November 2010 12:22 | Print | | Hits: 7848

History

This aircraft was the first design made by Frits Koolhoven in service of the NVI (Nederlandse Vliegtuig Industrie = Dutch Aircraft Industry). The aircraft, a hunter- reconnaissance aircraft, was shown in public at the air-show at Paris in 1923.
The flying qualities proofed to be disappointing, so a second, much improved prototype was built.
The French factory Etablissement Buscaylet-De Monge received a license. The first and only French aircraft, designation M.101C-2, built, was tested but the French air force, but no order followed.

 

Technical information
Dimensions:
Length: 7,8 m Wingspan: 13,7 m
Height: 3,4 m Wing area: 27,2 m2
Weights:
Empty weight: 1050 kg Max. start weight: 1800 kg
Performances:
Max. speed: 255 km/hr Climbing speed: - m/min
Cruising speed: - km/hr    
Range: 6 hours Service ceiling: 7200 m
Miscellaneous:
Engine type: One Bristol Jupiter rated 450 hp
Crew: One aviator
Armament:

-

 


In 1923 the LA-KNIL was looking for a fighter-reconnaissance aircraft. After comparing the Fokker C.V and the NVI FK-31 (also known as Koolhoven FK-31) the Fokker proofed to be much better.
Despite the outcome of the competition the LA ordered in 1924 also four NVI FK-31 to be able to test the air-cooled engine under tropical conditions.
They were delivered in March 1926. Because maintenance of the aircraft proofed to be difficult, the FK-31 was written of in 1930.

 


Serial Construction nr. Date in service Date out of service Notes
K.421   03-1926 06-1930  
K.422   03-1926 06-1930  
K.423   03-1926 06-1930  
K.424   03-1926 06-1930  

 


1/72nd Scale

Kits

  • Vami
    • Kit XX: a resin kit of an early Fk-31 (different tail unit).
  • Omega
    • Kit 72462: A resin kit of a production FK-31 with Belgian markings.
    • Kit 72464: A resin kit of a Koolhoven FK31 (H-NACA, F-AHAE prototypes).
    • Kit 72460: A resin kit of a Koolhoven FK31 Prototype.
    • Kit 72436: A resin kit of a Koolhoven FK31 (H-NACG).
    • Kit 72459: A resin kit of a De Monge - Koolhoven M101c-2.
    • Kit 72463: A resin kit of a De Monge - Koolhoven M101.

Of these models only Omega-kits 72462 and 72459 are suitable to built a FK-31 of the NEIAF without modifications.

Modeling add-on

  • Aeroclub
    • Set E033: 9 cyl. Bristol Jupiter IV/VI (Gamecock, Woodcock)

Decals

  • --
    • Set --: --

1/48th Scale

Kits

  • -
    • Kit -: -

Modeling add-on

  • --
    • Set --: --

Decals

  • --
    • Set --: --

 


Scheme Colour name FS number WEM Humbrol XtraColor Vallejo Model Color Vallejo Model Air
Standard #1 Overall LVA Khaki   AC D04 29? / 155? x2? /x251? 70.921? / 70.887  

Check www.paint4models.com for an extensive conversion table with lots of colour and paint systems.

 


Literature.

Militaire Luchtvaart in Nederlandsch-Indië in beeld. Deel 1 Hugo Hooftman Pag. 64 - 65 1978 Uitgever: Europese Bibliotheek, Zaltbommel
Koolhoven Nederlandse vliegtuigbouwer in de schaduw van Fokker Theo Wesselink & Thijs Postma Pag. 47 - 53 1981 Uitgever: Unieboek b.v., Houten
De Nederlandse Vliegtuigen: Alle vliegtuigen ooit in Nederland ontworpen en gebouwd Theo Wesselink & Thijs Postma Pag. 37 1982 Uitgever: Romen Luchtvaart, Haarlem
40 Jaar luchtvaart in Indië Gerard Casius & Thijs Postma Pag. 22 - 25 1986 Uitgeverij De Alk, Alkmaar

 

Websites.