D.521 (Great Britain)

▄D.521

▄D.521

Britain

II Rank

Battle rating:

AB	RB	SB
3.3	3.0	2.7

Class:

Fighter

Purchase:Bundle or Gift

Description

The ▄D.521 is a gift rank II British fighter with a battle rating of 3.3 (AB), 3.0 (RB), and 2.7 (SB). It 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

at 6 500 m570 km/h

Turn time21 s

Max altitude12 000 m

EngineRolls-Royce Merlin-III

TypeInline

Cooling systemWater

Take-off weight3 t

Characteristics	Max Speed (km/h at 6,500 m)		Max altitude (metres)	Turn time (seconds)		Rate of climb (metres/second)		Take-off run (metres)
	AB	RB		AB	RB	AB	RB
Stock	548	536	12000	22.4	22.9	5.8	7.3	310
Upgraded	594	570		19.6	21.0	16.0	10.0

Details

Features
Combat flaps	Take-off flaps	Landing flaps	Air brakes	Arrestor gear
✓	✓	✓	X	X

Limits
Wings (km/h)	Gear (km/h)	Flaps (km/h)			Max Static G
		Combat	Take-off	Landing	+	-
0	340	400	340	280	~9	~8

Optimal velocities (km/h)
Ailerons	Rudder	Elevators	Radiator
< 400	< 430	< 460	> 330

Compressor (RB/SB)
Setting 1
Optimal altitude	100% Engine power	WEP Engine power
4,953 m	924 hp	1,024 hp

Survivability and armour

Crew1 person

Speed of destruction

Structural0 km/h

Gear340 km/h

• 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

Modifications and economy

Repair costBasic → Reference

AB590 → 802

RB1 232 → 1 675

SB1 665 → 2 264

Total cost of modifications10 380

13 730

Talisman cost750

Crew training6 300

Experts22 000

Aces250

Research Aces220 000

Reward for battleAB / RB / SB

40 / 100 / 200 %

124 / 124 / 124 %

Modifications

Flight performance	Survivability	Weaponry
Fuselage repair Research: 690 Cost: 910 105 Radiator Research: 690 Cost: 910 105 Airframe Research: 780 Cost: 1 000 115 Compressor Research: 780 Cost: 1 000 115 Wings repair Research: 870 Cost: 1 200 130 Engine Research: 870 Cost: 1 200 130 Cover Research: 840 Cost: 1 100 125 Engine injection Research: 840 Cost: 1 100 125	EFS(a) Research: 840 Cost: 1 100 125	7_5mm_belt_pack Research: 690 Cost: 910 105 mac39_new_gun Research: 780 Cost: 1 000 115 hispano_belt_pack Research: 870 Cost: 1 200 130 hispano_404_new_gun Research: 840 Cost: 1 100 125

Armaments

Offensive armament

Weapon 120 mm Hispano 404 cannon

Ammunition60 rounds

Fire rate700 shots/min

Weapon 24 x 7.5 mm MAC 1934 machine gun

Ammunition2 700 rounds

Fire rate1 350 shots/min

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 guns, wing-mounted (675 rpg = 2,700 total)

Usage in battles

Describe the tactics of playing in the aircraft, the features of using aircraft in a team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view, but instead, give the reader food for thought. Examine the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).

Manual Engine Control

MEC elements
Mixer	Pitch	Radiator			Supercharger	Turbocharger
		Oil	Water	Type
Controllable	Controllable Not auto controlled	Controllable Auto control available	Controllable Auto control available	Separate	Not controllable 1 gear	Not controllable

Modules

Tier	Flight performance		Survivability	Weaponry
I	Fuselage repair	Radiator		Offensive 7 mm
II		Compressor	Airframe	New 7 mm MGs
III	Wings repair	Engine		Offensive 20 mm
IV		Engine injection	Cover	New 20 mm cannons

Pros and cons

Pros:

• 5 guns: one 20 mm 404 Hispano cannon near the nose of the aircraft and four 7.5 mm 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

Cons:

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

History

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.

Media

Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

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

External links

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