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Netherlands' Fokker D.XXI fighter

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Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter
Aeronautics Aircraft Spotters' Handbook

Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter
Aeronautics Aircraft Spotters' Handbook

Design

In 1935 / 1936 Fokker launched the D.XXI project.

It had a composite airframe and cover. The landing gear was fixed under the D.XXI's low wing.

The Fokker D.XXI was very maneouverable.

Prototype

The D.XXI prototype flew on March 27, 1936. It had a Bristol Mercury VI-S radial engine (645 HP). The prototype showed excellent abilities but there was a lack of official interest for fighters.

Production

An order for 36 D.XXIs was placed in the summer of 1937.

  • Fokker: 39, 46
  • Danish Royal Army Aircraft Factory: 10
  • VL (Finnish State Factory): 90
  • Total: 146

Finland

In 1937 Finland ordered seven production models and an agreement was made to allow the Finns to license built the D.XXI.

The State Aircraft Factory constructed 93 fighters during 1938 to 1944.

The first 38 had Bristol engines. The next 50 had American Pratt & Whitney Twin Wasp Junior radial engines (836 HP / 1,050 HP). The last five had Bristol Pegasus engines.

Denmark

Denmark constructed ten aircraft under license.

Usage

Denmark, Finland, and the Netherlands used the Fokker D.XXI. Spain produced the D.XXIs under a license agreement.

German Invasion

When Germany invaded, there were only 32 D.XXIs available. After three days they had run out of ammunition.

On May 10, 1940, a group of D.XXIs shot down 38 out of 55 Junkers Ju 52s that were crossing the Dutch border.

Finland

The Finnish air force had over 100 D.XXIs. The D.XXIs were used in the Winter War and the Continuation War. The last D.XXI was retired in 1951.

Specifications

  Fokker D.XXI
Type Fighter
Crew 1
Engine (Type) Bristol Mercury VIII
Bristol Mercury
OR Bristol Perseus
Cylinders Radial, Radial 9
Cooling Air
Net HP 760, 800
Propeller blades 3
Dimensions  
Span 36', 36' 1"
11 m
Length 26' 3", 26' 11"
8.2 m
Height 9' 3", 9' 8"
2.95 m
Wing area  
Weight  
Empty  
Loaded 4,000 lb, 4,519 lb
Performance  
Speed 270 mph, 286 mph
Speed @ 9,000' /
2,743 m
 
Speed @ 14,540' /
4,420 m
286 mph
460 kph
Cruising speed  
Endurance  
Climb  
Service ceiling 36,100'
11,000 m
Range 590 miles, 600 miles
950 km
Armament 4: MG
Wings 2: MG
Fuselage Sides 2: MG
Dutch 4: 7.9 mm MG
Finnish 4: 7.7 mm MG
Danish 2: 7.9 mm MG
2: 20 mm
  Fokker D.XXI (Mercury engine)
Type  
Crew  
Engine (Type) Bristol Mercury VII or VIII
Cylinders Radial 9
Cooling  
Net HP 830
Propeller blades  
Dimensions  
Span 36' 1"
11 m
Length 26' 11"
8.2 m
Height 9' 8"
2.95 m
Wing area  
Weight  
Empty 3,197 lb
1,450 kg
Loaded 4,519 lb
2,050 kg
Performance  
Speed  
Speed @ 16,730' /
6,000 m
286 mph
460 kph
Cruising speed  
Endurance  
Climb  
Climb to 9,840' /
3,000 m
3.5 minutes
Service ceiling 33,135'
10,100 m
Range 578 miles
930 km
Armament  
  Fokker D.XXI (Twin Wasp engine)
Type  
Crew  
Engine (Type) Pratt & Whitney R-1535-SB4-C/G Twin Wasp Junior
Cylinders Radial 14
Cooling  
Net HP 825
Propeller blades  
Dimensions  
Span  
Length 26' 3"
8 m
Height  
Wing area  
Weight  
Empty 3,380 lb
1,533 kg
Loaded 4,820 lb
2,186 kg
Performance  
Speed  
Speed @ 9,000' /
2,743 m
272 mph
438 kph
Cruising speed  
Endurance  
Climb  
Climb to 9,840' /
3,000 m
4.5 minutes
Service ceiling 32,000'
9,754 m
Range  
Armament  

Sources:

  1. Complete Book of World War II Combat Aircraft, Enzo Angelucci, Paolo Matricardi, Pierluigi Pinto, 1988
  2. Aircraft of WWII, Stewart Wilson, 1998
  3. World War II Airplanes Volume 1, Enzo Angelucci, Paolo Matricardi, 1976
  4. Aeronautics Aircraft Spotters' Handbook, Ensign L. C. Guthman, 1943
20th Century American Military History Crucial Site