J21A-1

J21A-1

J22-B

J21A-2

J21A-1

J22-B

J21A-2

Sweden

IV Rank

Battle rating:

AB	RB	SB
5.3	4.3	3.3

Class:

Fighter

Research:46 000

Purchase:155 000

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This page is about the Swedish fighter J21A-1. For other versions, see J21 (Family).

Description

The J21A-1 is a rank IV Swedish fighter with a battle rating of 5.3 (AB), 4.3 (RB), and 3.3 (SB). It was introduced in Update 1.95 "Northern Wind" along with the rest of the Swedish air tree.

General info

Flight performance

The J21 series is arguably the most iconic propeller-engined aircraft to ever come out of Sweden. For the time, they were underpowered, slow aircraft that were were outclassed by nearly all opponents it could have faced. It's distinctive twin-boom, rear-engined facia is easy to recognize and its performance is nothing to scoff at either. The Akan m/39A's are some of the most effective non-cannon aircraft weaponry in the game, boasting superior aspects to even the famed M2 Browning, specifically in terms of raw stopping power and muzzle velocity. The Akan m/41A's are quite powerful as well. The challenge for the pilot is to manoeuvre this aircraft into a solid shooting solution which can be difficult especially against more agile aircraft. Although suffering from a relatively low rip speed, skilled and new pilots can use this somewhat to their advantage, mainly by diving on opponents and climbing again, although this shouldn’t be attempted at extreme speeds.

Characteristics	Max Speed (km/h at 4,300 m)		Max altitude (metres)	Turn time (seconds)		Rate of climb (metres/second)		Take-off run (metres)
	AB	RB		AB	RB	AB	RB
Stock	616	599	10800	21.0	21.9	12.6	12.6	300
Upgraded	666	640		19.0	20.0	19.0	15.5

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	+	-
683	325	460	460	325	~11	~5

Optimal velocities (km/h)
Ailerons	Rudder	Elevators	Radiator
< 450	< 390	< 420	> 715

Survivability and armour

Protective components found in the J21A-1.

• 10 mm steel - Firewall armour plate
• 10 mm steel - Firewall cover armour plate
• 10 mm steel - Pilot's back armour plate
• 60 mm bulletproof glass

Armaments

Offensive armament

The J21A-1 is armed with:

• 1 x 20 mm Akan m/41A cannon, nose-mounted (140 rpg)
• 2 x 13.2 mm Akan m/39A machine guns, nose-mounted (350 rpg = 700 total)
• 2 x 13.2 mm Akan m/39A machine guns, wing-mounted (325 rpg = 650 total)

The automatkanon m/41A is essentially a slower firing Hispano 404 with more ammunition, with all the advantages and disadvantages that come with it. While one might think that the slower firing speed is a disadvantage, it is just high enough to still be effective and is very beneficial for conserving ammunition. It is important to note that when stock, the cannon is very inaccurate and overheats quickly, but becomes quite accurate after modifications.

The complimentary automatkanon m/39A heavy machine guns are, as mentioned previously, arguably the best non-cannon weapons in the game. Their high muzzle velocity, very high fire rate and reasonable accuracy allow them to saturate the sky with lead. The higher calibre of 13.2 mm allows for more stopping power than the typical 12.7 mm and converts them from just being a nuisance to a threat to be heeded. It is interesting to note that due to their HEF-T rounds, they technically fall under the category of "cannon", as normally exploding rounds typically start at 20 mm.

Usage in battles

For pilots just beginning to learn this aircraft's flight characteristics, it is best used as a support aircraft, it is too slow to take into dives reliably and suffers from Yak-like rip speeds, without any of the benefits that the Yaks have in agility. For pilots with more experience, you can successfully push this aircraft to its limits and beyond and eliminate lesser experienced pilots in more agile aircraft or even other more experienced pilots through strong counter-manoeuvres.

Specific Enemies Worth Noting:

• P-47D-25/28: The high-speed Thunderbolts are a menace in any game mode. They are some of the fastest things in the bracket and sport an octet of the late M2 Brownings that will set you ablaze in a few short bursts. While they are already quick at medium altitudes, they become even faster at high altitudes, easily blitzing past the poor J21. However, they have incredibly poor turn rates and climb just as badly. The go-to tactic versus a P-47 is to turn with it in order to get on its tail then shread it with your guns.
• M.B.157: The 157 is one of the worst enemies you can come across as it is basically a Thunderbolt that can turn and climb. Its ludicrous speed along with excellent climb rate and its above-average manoeuvrability make for an enemy that you cannot face in a 1-on-1. Your best bet is to try to head-on it if you can manage to do so. The one Achilles heel of the 157 is its low ammunition count, so try to get it to waste as much ammo as possible before it needs to disengage. At this point, you can either try to gun it down or attempt to regain altitude so you may catch it later.
• Bf 109 F series: The F series of 109's are noteworthy adversaries whose strengths change with the model. The F-1 and F-2 will turn better than you and climb quite well but you are, the F-4 is almost a hard counter depending on if it runs gunpods. Without gunpods, the F-4 out-speeds, outclimbs, outturns and out-accelerates the J21, outclassing it in every way. But since most F-4's run gunpods, their decreased performance helps even the odds. Boom & Zoom the F-1 and F-2, head on the F-4 only as a last resort.

Manual Engine Control

MEC elements
Mixer	Pitch	Radiator			Supercharger	Turbocharger
		Oil	Water	Type
Not controllable	Controllable Auto control available	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 20 mm
II		Compressor	Airframe		Offensive 13 mm
III	Wings repair	Engine		New 20 mm cannons
IV		Engine injection	Cover		New 13 mm MGs

Pros and cons

Pros:

• Very stable, does not stall in level flight even with the throttle set to zero
• Engine protected from head-on attacks
• Highly effective and accurate armament layout that will tear through enemies like paper
• Can take quite a few hits and still fly reasonably well
• Very high energy retention
• Easy to land thanks to its tricycle landing gear
• Rear-mounted engine makes head-ons safer (can't be hit during head-on)

Cons:

• Pusher aircraft, engine mounted facing rear, can be hit by tailing aircraft
• Fuel tanks can take damage if you pull up from a dive on an enemy plane
• Required to set convergence due to wing-mounted machine guns
• Agility is quite poor, it is subpar to most aircraft
• High repair cost
• Engine overheats during takeoff and during flight at WEP even with full modifications
• Very low rip speed - cannot push past 640 km/h (400 mph) without threatening to rip off wings

History

The SAAB 21 is a twin-boom pusher fighter and attacker designed by the famed Swedish engineer Frid Wänström (pronounced "Vanstrom"), who also worked on the SAAB 29 Tunnan, 32 Lansen, 35 Draken and 37 Viggen. In the anticipation and wake of World War 2, Sweden was concerned over its neutrality policy coming under threat by the other European countries, specifically hostile ones such as Nazi Germany. In order to deter belligerent forces and potential aggressors, the Swedish Air Force created a major plan to modernize their fleet, which included the import of foreign models such as the Italian CR.42 and Re.2000 as a stopgap measure.

Meanwhile, Swedish corporation SAAB began studying designs for the possible development of a new, high-performance fighter aircraft. Most of the designs were based around the Bristol Taurus two-row 14 cylinder radial engine developing around 1,000~1,100 horsepower. The most promising design was a twin-boom pusher layout and made use of many new features unfamiliar to the SAAB technicians and engineers at the time, but was able to compete with the other fighter aircraft at the time while also maintaining several advantages such as a heavy amount of nose-mounted armament and superior pilot visibility, along with ease of maintenance. The design was kept dormant until 41, as Sweden was beginning to see that it would not be able to procure improved foreign models as a result of the war, they started another rearmament program to adopt advanced indigenous fighter aircraft.

Accordingly, SAAB blew the dust off of their old twin-boom design and set to work. Earlier on, it was decided to replace the Bristol Taurus with an American Pratt-&-Whitney Twin Wasp, but this was changed when the engine manufacturer Svenska was requested to provide an alternative engine, which was difficult due to the time constraints. Thus, they decided that a licensed engine would be the best course of action. The legendary German Daimler-Benz DB 605 that powered many famous designs was chosen and modified to fit Swedish needs. Three prototypes were completed and its maiden flight was completed in 1942.

The type was delivered in 1945, and a total of 300 models were produced.

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See also

Related development

• J21 (Family)

External links

• [Devblog] SAAB J21A-1: Nordic Exotic

Swedish Aeroplane Company Ltd. (SAAB)
	Pre-SAAB: SA / ASJA
SA 'Jaktfalken'	J6B
SAAB 17	B17A · B17B · S17BS
SAAB 18	B18A · B18B · T18B · T18B (57)
SAAB 21	J21A-1 · J21A-2 · A21A-3 · J21RA · A21RB
SAAB 29 'Tunnan'	J29A · A29B · J29D · J29F
SAAB 32 'Lansen'	J32B · A32A · A32A Röd Adam
SAAB 35 'Draken'	J35A · J35D
SAAB 37 'Viggen'	JA37C · JA37D · JA37DI · JA37DI F21 · AJ37 · AJS37
SAAB 39 'Gripen'	JAS39A · JAS39C
SAAB 105	SK60B · SAAB-105G
License Production	B3C (Ju 86K)
Export	SAAB-105OE · J35XS · ▄JAS39C · ◔JAS39EBS HU C