Netherlands' Fokker D.XXI fighter

Photos

Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter

Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter

Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter
Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter

Fokker D.XXI fighter:
Netherlands' Fokker D.XXI fighter
Fokker D.XXI fighter damaged during Luftwaffe attack:
Netherlands' Fokker D.XXI fighter damaged during Luftwaffe attack

Fokker D.XXI fighter built in Finland with Pratt & Whitney engine:
Netherlands' Fokker D.XXI fighter built in Finland with Pratt & Whitney engine
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 / 19363 Fokker launched the D.XXI project.1,3

It had a composite airframe and cover.1,3 The landing gear was fixed under the D.XXI's low wing.1,3

The Fokker D.XXI was very maneouverable.1

Prototype

The D.XXI prototype flew on March 27, 1936.1,2 It had a Bristol Mercury VI-S radial engine (645 HP).1,2 The prototype showed excellent abilities but there was a lack of official interest for fighters.1

Production

An order for 36 D.XXIs was placed in the summer of 1937.1

  • Fokker3: 393, 462
  • Danish Royal Army Aircraft Factory: 102
  • VL (Finnish State Factory): 902,3
  • Total: 1462

Finland

In 1937 Finland ordered seven production models and an agreement was made to allow the Finns to license built the D.XXI.1,3

The State Aircraft Factory constructed 93 fighters during 1938 to 1944.1

The first 38 had Bristol engines.1 The next 50 had American Pratt & Whitney Twin Wasp Junior radial engines (836 HP / 1,050 HP3).1,3 The last five had Bristol Pegasus engines.1

Denmark

Denmark constructed ten aircraft under license.1

Usage

Denmark, Finland, and the Netherlands used the Fokker D.XXI.2,3 Spain produced the D.XXIs under a license agreement.3

German Invasion

When Germany invaded, there were only 32 D.XXIs available.1 After three days they had run out of ammunition.2

On May 10, 1940, a group of D.XXIs shot down 38 out of 55 Junkers Ju 52s that were crossing the Dutch border.1

Finland

The Finnish air force had over 100 D.XXIs.1 The D.XXIs were used in the Winter War and the Continuation War.2 The last D.XXI was retired in 1951.2

Specifications

  Fokker D.XXI
Type Fighter1,2,3,4
Crew 11,2,3
Engine (Type) Bristol Mercury VIII1,3
Bristol Mercury4
OR Bristol Perseus4
Cylinders Radial4, Radial 91,3
Cooling Air1,3
Net HP 7601,3, 8004
Propeller blades 32
Dimensions  
Span 36'4, 36' 1"1,3
11 m1
Length 26' 3"4, 26' 11"1,3
8.2 m1
Height 9' 3"4, 9' 8"1,3
2.95 m1
Wing area  
Weight  
Empty  
Loaded 4,000 lb4, 4,519 lb3
Performance  
Speed 270 mph4, 286 mph3
Speed @ 9,000' /
2,743 m
 
Speed @ 14,540' /
4,420 m
286 mph1
460 kph1
Cruising speed  
Endurance  
Climb  
Service ceiling 36,100'1,3
11,000 m1
Range 590 miles1, 600 miles4
950 km1
Armament 4: MG1
Wings 2: MG3,4
Fuselage Sides 2: MG3,4
Dutch 4: 7.9 mm MG2
Finnish 4: 7.7 mm MG2
Danish 2: 7.9 mm MG2
2: 20 mm2
  Fokker D.XXI (Mercury engine)
Type  
Crew  
Engine (Type) Bristol Mercury VII or VIII2
Cylinders Radial 92
Cooling  
Net HP 8302
Propeller blades  
Dimensions  
Span 36' 1"2
11 m2
Length 26' 11"2
8.2 m2
Height 9' 8"2
2.95 m2
Wing area  
Weight  
Empty 3,197 lb2
1,450 kg2
Loaded 4,519 lb2
2,050 kg2
Performance  
Speed  
Speed @ 16,730' /
6,000 m
286 mph2
460 kph2
Cruising speed  
Endurance  
Climb  
Climb to 9,840' /
3,000 m
3.5 minutes2
Service ceiling 33,135'2
10,100 m2
Range 578 miles2
930 km2
Armament  
  Fokker D.XXI (Twin Wasp engine)
Type  
Crew  
Engine (Type) Pratt & Whitney R-1535-SB4-C/G Twin Wasp Junior2
Cylinders Radial 142
Cooling  
Net HP 8252
Propeller blades  
Dimensions  
Span  
Length 26' 3"2
8 m2
Height  
Wing area  
Weight  
Empty 3,380 lb2
1,533 kg2
Loaded 4,820 lb2
2,186 kg2
Performance  
Speed  
Speed @ 9,000' /
2,743 m
272 mph2
438 kph2
Cruising speed  
Endurance  
Climb  
Climb to 9,840' /
3,000 m
4.5 minutes2
Service ceiling 32,000'2
9,754 m2
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

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