Nederlandse Modelbouw en Luchtvaartsite

Dutch Modelling and Aviation

In Memoriam

Klaas Willem Jonker
† 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.

Fokker C.IV


This type was released to succeed the Fokker C.III, which was built in a small series for Spain.
In fact it was a development from the Fokker C.I. The aircraft, in fact a long range scout, had a rather broad fuselage, with much room for the crew, who appreciated this very much.
A disadvantage was the decrease of the maximum speed

Three variants were developed:

Fokker C.IVA:
with a smaller wing span of 12,07 m;
Fokker C.IVB:
with a larger wing span of 12,91 m
Fokker C.IVC:
with a wing span of 14.28 m.

According to Fokker, the wings could be exchanged by four men within 45 minutes.

Three aircraft were sold to the USA, after a demonstration for General Mitchell. These aircraft were tested under the designation CO-4 #1 till CO-4 #3 (CO-4 = Corps Observation model 4).
One of these aircraft was completely restored to flying condition at the Owl Head Museum. (check website: Fokker C.IV flies again.)

A smaller version was the Fokker D.C.I. only used by the NEIAF.

Spain intended to built the D.C.I under license, but choose to built and use the Fokker C.IV, of which twenty were built at Madrid.

In 1924 200 aircraft were exported to Russia and in 1923 the Argentine navy ordered three aircraft equipped with floats.


Technical information Fokker C.IVB
Length: 9,3 m Wingspan: 12,9 m
Height: 3,4 m Wing area: 39,2 m2
Empty weight: 1450 kg Max. start weight: 2270 kg
Max. speed: 214 km/hr Climbing speed: - m/min
Cruising speed: - km/hr    
Range: 1200 km Service ceiling: 5500 m
Engine type: One Napier Lion rated 450 hp.

Two men: one aviator plus one observer/air gunner

Armament: Three or four7.9 mm machine guns



a fighter version with reduced wingspan of 12.07 m an a lower start weight.
The standard production version with a wingspan of 12,91 m and equipped with a Napier Lion engine of 450 hp, a Rolls Royce Eagle or American Liberty engine.
long range scout with extended wingspan of 14.28 m. Delivered to the LVA
  • C.IV-W: Version of the C.IVC with floats and a Napier Lion engine.
Special built aircraft for the 1924 flight from Amsterdam to Tokyo.
US Army designation for three evaluation examples.
US Army designation for five production aircraft with a 420 hp Liberty L-12A and an (with 24 cm) enlarged fuselage.
US Army designation for a modified XCO-4.