D.521 (Great Britain)

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General characteristics
1 personCrew
2.8 tTake-off weight
2.39 kg/sBurst mass
Flight characteristics
12 000 mCeiling
Rolls-Royce Merlin-IIIEngine
waterCooling system
Speed of destruction
800 km/hStructural
340 km/hGear
Offensive armament
20 mm Hispano 404 cannonWeapon 1
60 roundsAmmunition
701 shots/minFire rate
4 x 7.5 mm MAC 1934 machine gunWeapon 2
2 700 roundsAmmunition
1 350 shots/minFire rate
Sl icon.png2 190 / 2 770/2 630 / 3 326/1 230 / 1 555Repair
11 000 Sl icon.pngCrew training
38 000 Sl icon.pngExperts
250 Ge icon.pngAces
124 % Rp icon.pngReward for battle
230 % Sl icon.png250 % Sl icon.png60 % Sl icon.png


The D.521 (Great Britain) in the garage

The ▄D.521 is a Rank II gift British fighter with a battle rating of 3.3 (AB) and 2.7 (RB/SB). This aircraft was introduced in the game during the Open Beta session during the 13 June 2013 event "Vive la Liberté!" and remains as an event vehicle today. The D.521 was a modified variant of the French Dewoitine D.520 which featured a Rolls Royce Merlin III engine and slight armament changes. Only one model was ever produced.

The D.521 is essentially a slightly improved version of the D.520. It has a somewhat improved engine (Rolls-Royce Merlin III) which constitutes the one major change. It does however have a slightly worse turn and climb rate which may be due to the added weight of said engine. At either rate, tactically, it is advised that you have good knowledge of the various aircraft's you will face as it does not excel at any one thing. By applying situational awareness and a degree of caution to your approach, you may find yourself to be quite successful with this machine, but regardless of if you approach this in Arcade or Realistic battles, you need to have a good idea about the aircraft you are likely to face in the battle rating of this aircraft.

General info

Flight Performance

Max Speed
(km/h at 6,500 m)
Max altitude
Turn time
Rate of climb
Take-off run
548 536 12 000 22.4 22.9 5.8 7.3 310
Max Speed
(km/h at 6,500 m)
Max altitude (meters) Turn time (seconds) Rate of climb
Take-off run (meters)
594 570 12 000 19.6 21.0 16.0 10.0 310


Combat flap Take-off flap Landing flap Air brakes Arrestor gear
Wing-break speed
Gear limit
Combat flap
Max Static G
+ -
800 340 400 ~18 ~15
Optimal velocities
< 400 < 430 < 460 > 250
Compressor (RB/SB)
Setting 1
Optimal altitude 100% Engine power WEP Engine power
4,953 m 924 hp 1,024 hp

Survivability and armour

  • No armour plating
  • No armour glazing
  • Critical components located at the front of aircraft (fuel, pilot, engine, controls)
  • More fuel tanks located in wings near the fuselage


Offensive armament

The D.521 (Great Britain) is armed with:

  • 1 x 20 mm Hispano 404 cannon, nose-mounted (60 rpg)
  • 4 x 7.5 mm MAC 1934 machine gun, wing-mounted (675 rpg = 2,700 total)

Usage in the battles

Manual Engine Control

MEC elements
Mixer Pitch Radiator Supercharger Turbocharger
Oil Water Type
Controllable Controllable Not controllable Controllable Combined Not controllable Controllable


Tier Flight performance Survivability Weaponry
I Fuselage Repair Radiator
II Compressor Airframe
III Wings Repair Engine
IV Engine Injection Cover

Pros and cons


  • 5 Guns. One 20 mm 404 Hispano Cannon near the nose of the aircraft and 4 7.5mm MAC 1934 machine guns in the wings
  • Plenty of ammo for the machine-guns
  • Powerful nose-mounted 20 mm cannon
  • Good all round low tier fighter aircraft


  • Neither very manoeuvrable or very fast
  • Very little ammo for the 20 mm cannon. Limited to 60 shells
  • Relatively poor rate of climb


Describe the history of the creation and combat usage of the aircraft in more detail than in the introduction. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/ historical reference" (example: https://wiki.warthunder.com/Name-vehicles/historical reference) and add a link to it here using the main template. Be sure to include links to sources at the end of the article.

In-game description

A single-seat monoplane fighter with an all-metal construction, closed cockpit and retractable landing gear with a tail wheel. Designed by the SNCAM (Societe Nationale des constructions aeronautiques du Midi) company. The developmental prototype of the Dewoitine D.520-01 fighter took its maiden flight on 2 October 1938. Series production began at the SNCAM (later SNCASE) plant in Toulouse.

While perfecting the series-produced Dewoitine D.520 fighters, designers also worked to create new models of the same plane. In November 1939, work began on creating the Dewoitine D.521 model, equipped with the British liquid-cooled V12 Rolls-Royce Merlin Mk.III engine with a rated output of 1,030 hp. It was suggested that a fighter fitted with this engine could reach a maximum horizontal speed of 570 km/h.

Since an engine-mounted cannon could not be installed on the Rolls-Royce Merlin engine, two Hispano-Suiza H.S.404 cannons were mounted on the wings instead. This meant that all the Dewoitine D.521's weaponry was mounted on the wings, and consisted of two 20 mm Hispano-Suiza HS.404 drum magazine cannons with 60 shells each and four 7.5 mm Chatellerault MAC 1934 machine guns with 675 rounds each.

Note that precise information (primarily photographs) on the practical configuration of the Dewoitine D.521's Hispano-Suiza wing-mounted cannons is not available. For this reason, we can only make educated guesses about the fighter's armament structure.

One of the early series-produced Dewoitine D.520 fighters was selected to be adapted as the Dewoitine D.521-01 prototype. Its maiden flight took place on 9 February 1940. It had an improved climbing rate, but the Rolls-Royce Merlin engine was significantly heavier than the Hispano-Suiza 12Y installed on the series-produced planes, and this caused problems with the plane's center of gravity. Testing continued until March 1940. On the whole, the new plane failed to exceed the performance of the series-produced Dewoitine D.520s, and the Dewoitine D.521 project was closed.


An excellent addition to the article will be video guides, as well as screenshots from the game and photos.

Read also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example,

  • reference to the series of the aircraft;
  • links to approximate analogues of other nations and research trees.


Paste links to sources and external resources, such as:

  • topic on the official game forum;
  • page on aircraft encyclopedia;
  • other literature.

Dewoitine (SNCAM/SNCASE)
Fighters  D.371 · D.371 H.S.9 · D.373
  D.500 · D.501 · Pallier's D.510
Export  ▄D.520 · ▄D.521

Britain fighters
Fury  Fury Mk I · Fury Mk II
Nimrod  Nimrod Mk I · Nimrod Mk II
Gladiator  Gladiator Mk II · Tuck's Gladiator Mk II · Gladiator Mk IIF · Gladiator Mk IIS
Sea Gladiator  Sea Gladiator Mk I
Hurricane  Hurricane Mk I/L · Hurricane Mk.I/L FAA M · Hurricane Mk IIB/Trop · Hurricane Mk IV
Sea Hurricane  Sea Hurricane Mk IB · Sea Hurricane Mk IC
Spitfire (early-Merlin)  Spitfire Mk Ia · Spitfire Mk IIa · Spitfire Mk.IIa Venture I · Spitfire Mk IIb · Spitfire Mk Vb/trop · Spitfire Mk Vb · Spitfire Mk Vc/trop · Spitfire Mk Vc
Spitfire (late-Merlin)  Spitfire F Mk IX · Spitfire LF Mk IX · Spitfire F Mk IXc · Plagis' Spitfire LF Mk IXc · Spitfire F Mk XVI
Spitfire (Griffon)  Spitfire F Mk XIVc · Spitfire F Mk XIVe · Spitfire FR Mk XIVe · Spitfire F Mk XVIIIe · Spitfire F Mk 22 · Spitfire F Mk 24
Seafire  Seafire F Mk XVII · Seafire FR 47
Typhoon  Typhoon Mk Ia · Typhoon Mk Ib · Typhoon Mk Ib/L
Tempest  Tempest Mk II · Tempest Mk V · Tempest Mk V (Vickers P)
Sea Fury  Sea Fury FB 11
Other  MB.5 · Firecrest · Wyvern S4
Australia  ▄Boomerang Mk I · ▄Boomerang Mk II
France  ▄D.520 · ▄D.521
USA  Martlet Mk IV · ▄Corsair F Mk II · ▄Hellcat Mk II · ▄Thunderbolt Mk.1 · ▄Mustang Mk IA