J21A-1

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This page is about the Swedish fighter J21A-1. For other versions, see J21 (Family).
J21A-1
saab_j21a_1.png
GarageImage J21A-1.jpg
360://https://wiki.warthunder.com/images/1/1f/Cockpit_saab_j21a_1.jpg
J21A-1
AB RB SB
4.7 4.0 3.3
Class:
Research:26 000 Specs-Card-Exp.png
Purchase:110 000 Specs-Card-Lion.png
Show in game

Description

The J21A-1 is a rank III Swedish fighter with a battle rating of 4.7 (AB), 4.0 (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

Max speed
at 4 300 m640 km/h
Turn time20 s
Max altitude10 800 m
EngineDaimler-Benz DB-605B
TypeInline
Cooling systemWater
Take-off weight5 t

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. Its distinctive twin-boom, rear-engined fascia is easy to recognize and its performance is nothing to scoff at either, though the climb rate is poor and the engine overheats quickly when using WEP. 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 + -
683 325 445 425 325 ~11 ~5
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 450 < 390 < 420 > 715

Survivability and armour

Protective components found in the J21A-1.
Crew1 person
Speed of destruction
Structural683 km/h
Gear325 km/h
  • 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

Modifications and economy

Repair costBasic → Reference
AB1 800 → 2 291 Sl icon.png
RB5 000 → 6 365 Sl icon.png
SB2 840 → 3 615 Sl icon.png
Total cost of modifications25 200 Rp icon.png
59 700 Sl icon.png
Talisman cost1 100 Ge icon.png
Crew training32 000 Sl icon.png
Experts110 000 Sl icon.png
Aces500 Ge icon.png
Research Aces320 000 Rp icon.png
Reward for battleAB / RB / SB
50 / 130 / 170 % Sl icon.png
142 / 142 / 142 % Rp icon.png
Modifications
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
Research:
1 700 Rp icon.png
Cost:
4 000 Sl icon.png
140 Ge icon.png
Mods radiator.png
Radiator
Research:
1 700 Rp icon.png
Cost:
4 000 Sl icon.png
140 Ge icon.png
Mods compressor.png
Compressor
Research:
1 900 Rp icon.png
Cost:
4 500 Sl icon.png
150 Ge icon.png
Mods aerodinamic wing.png
Wings repair
Research:
2 100 Rp icon.png
Cost:
5 000 Sl icon.png
170 Ge icon.png
Mods new engine.png
Engine
Research:
2 100 Rp icon.png
Cost:
5 000 Sl icon.png
170 Ge icon.png
Mods metanol.png
Engine injection
Research:
2 700 Rp icon.png
Cost:
6 400 Sl icon.png
220 Ge icon.png
Mods armor frame.png
Airframe
Research:
1 900 Rp icon.png
Cost:
4 500 Sl icon.png
150 Ge icon.png
Mods armor cover.png
Cover
Research:
2 700 Rp icon.png
Cost:
6 400 Sl icon.png
220 Ge icon.png
Mods ammo.png
akan_m47_belt_pack
Research:
1 700 Rp icon.png
Cost:
4 000 Sl icon.png
140 Ge icon.png
Mod arrow 1.png
Mods ammo.png
13_2_akan_m39_belt_pack
Research:
1 900 Rp icon.png
Cost:
4 500 Sl icon.png
150 Ge icon.png
Mod arrow 1.png
Mods weapon.png
akan_m47_new_gun
Research:
2 100 Rp icon.png
Cost:
5 000 Sl icon.png
170 Ge icon.png
Mods weapon.png
13_2_akan_m39_new_gun
Research:
2 700 Rp icon.png
Cost:
6 400 Sl icon.png
220 Ge icon.png

Armaments

Offensive armament

Ammunition140 rounds
Fire rate630 shots/min
Ammunition1 350 rounds
Fire rate1 080 shots/min

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

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
  • 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.

Devblog

In 1941, Sweden started a domestic rearmament program in order to bolster the strength of its armed forces in an effort to ensure its neutrality during the ongoing war. Among the branches intended for reinforcement was the Swedish Air Force, which up until this point had mainly been operating foreign, partially outdated aircraft.

The SAAB company had already been working on a design study for a modern fighter aircraft since the early 1940s. Their project had a rather unorthodox design - a single-engine, twin-boom aircraft in a pusher configuration. With the arrival of the 1941 rearmament program, sparking a great interest for domestic aircraft production, SAAB began working on refining their design for mass production.

After further work, three full prototypes were constructed for testing, two of which were fully functional. In July 1943, the prototype of the SAAB 21 first took to the skies for its maiden flight. Production of the SAAB 21 began some time after its maiden flight, with the first aircraft reaching their units in December 1945.

Overall, over 50 J21A-1s were produced before production of the first model stopped by December 1946. In total however, close to 300 piston-engined J21s of all variants were produced before the production run of the type ended in 1949. 

Due to the J21’s introduction to service coinciding with the dawn of the jet age, the type didn’t remain in active service for too long. In fact, the J21 was retired in 1954 - some ten years after its initial introduction - and its only operator remains the Swedish Air Force.

Media

Skins
Images
Videos

See also

Related development
Aircraft of comparable role and configuration

External links


Swedish Aeroplane Company Ltd. (SAAB)
Pre-SAAB: ASJA  J6B
Fighters  J21A-1 · J21A-2 · A21A-3
Jet fighters  A21RB · J21RA · J29A · A29B · J29D · J29F · A32A · J32B · J35A · J35D · JA37C
Jet attackers  SK60B · SAAB-105G
Bombers  B17A · B17B · B17BS
Dive-bombers  B3C · B18A · B18B · T18B-1 · T18B-2
Export  SAAB-105OE

Sweden fighters
ASJA  J6B
Saab  J21A-1 · J21A-2 · A21A-3
FFVS  J22-A · J22-B
(Finland) VL  Mörkö-Morane · VL Myrsky II · Pyörremyrsky
(Netherlands) Fokker  Fokker D.XXI
Foreign Import  J8A · Iacobi's J8A · J11 · J20 · J26 · ▄Bf 109 G-6