Difference between revisions of "J21A-2"

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m (Changed the writing under the picture with the A21A-3. It stood before that it was J21A-2 flying, but it isn't a J21A-2 instead it's a A21A-3 flying.)
(→‎Pros and cons: Merged with J21A-1 and updated)
 
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−
{{Specs-Card|code=saab_j21a_2}}
 
 
{{About
 
{{About
 
| about = Swedish fighter '''{{PAGENAME}}'''
 
| about = Swedish fighter '''{{PAGENAME}}'''
 
| usage = other versions
 
| usage = other versions
 
| link = J21 (Family)
 
| link = J21 (Family)
 +
}}
 +
{{Specs-Card
 +
|code=saab_j21a_2
 +
|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg}}
 +
|cockpit=cockpit_saab_j21a_2.jpg
 
}}
 
}}
  
 
== Description ==
 
== Description ==
 
<!-- ''In the description, the first part should be about the history of and the creation and combat usage of the aircraft, as well as its key features. In the second part, tell the reader about the aircraft in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
 
<!-- ''In the description, the first part should be about the history of and the creation and combat usage of the aircraft, as well as its key features. In the second part, tell the reader about the aircraft in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
−
[[File:GarageImage_{{PAGENAME}}.jpg|420px|thumb|left]]
+
The J21A-2 was the second production series and an improved version of the [[J21A-1]] (though performance was improved, the J21 was still an obsolete aircraft at its time). The only differences between the A-1 and A-2 were a separated centre wing flap for the fuselage, and new cooling fins around the engine for the liquid and oil coolers.
−
{{Break}}
+
 
−
The '''{{Specs|name}}''' is a rank {{Specs|rank}} Swedish fighter {{Battle-rating}}. It was introduced in [[Update 1.95 "Northern Wind"]].
+
Introduced in [[Update 1.95 "Northern Wind"]], the J21A-2 has a similar playstyle as the [[J21A-1]] and keeps the similar firepower, except the 20 mm [[Akan m/41A (20 mm)|Akan m/41A]] has been replaced with a Bofors 20 mm [[Akan m/45 (20 mm)|Akan m/45]]. Due to the minimal changes, the J21A-2 keeps the same flight model and performance as the earlier version.
  
 
== General info ==
 
== General info ==
 
=== Flight performance ===
 
=== Flight performance ===
−
''Describe how the aircraft behaves in the air. Speed, manoeuvrability, acceleration and allowable loads - these are the most important characteristics of the vehicle.''
+
{{Specs-Avia-Flight}}
 +
<!-- ''Describe how the aircraft behaves in the air. Speed, manoeuvrability, acceleration and allowable loads - these are the most important characteristics of the vehicle.'' -->
  
 
{| class="wikitable" style="text-align:center" width="70%"
 
{| class="wikitable" style="text-align:center" width="70%"
Line 56: Line 61:
 
! Combat !! Take-off !! Landing !! + !! -
 
! Combat !! Take-off !! Landing !! + !! -
 
|-
 
|-
−
| {{Specs|destruction|body}} || {{Specs|destruction|gear}} || 460 || 460 || 325 || ~11 || ~5
+
| {{Specs|destruction|body}} || {{Specs|destruction|gear}} || 445 || 425 || 325 || ~11 || ~5
 +
|-
 +
|}
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
|-
 +
! colspan="4" | Optimal velocities (km/h)
 +
|-
 +
! Ailerons !! Rudder !! Elevators !! Radiator
 +
|-
 +
| < 450 || < 390 || < 420 || > 715
 
|-
 
|-
 
|}
 
|}
  
 
=== Survivability and armour ===
 
=== Survivability and armour ===
 +
{{Specs-Avia-Armour}}
 
<!-- ''Examine the survivability of the aircraft. Note how vulnerable the structure is and how secure the pilot is, whether the fuel tanks are armoured, etc. Describe the armour, if there is any, and also mention the vulnerability of other critical aircraft systems.'' -->
 
<!-- ''Examine the survivability of the aircraft. Note how vulnerable the structure is and how secure the pilot is, whether the fuel tanks are armoured, etc. Describe the armour, if there is any, and also mention the vulnerability of other critical aircraft systems.'' -->
  
Line 67: Line 83:
 
* 10 mm steel - Pilot's back armour plate
 
* 10 mm steel - Pilot's back armour plate
 
* 60 mm bulletproof glass
 
* 60 mm bulletproof glass
 +
* Engine fire system (EFS)
 +
 +
=== Modifications and economy ===
 +
{{Specs-Economy}}
  
 
== Armaments ==
 
== Armaments ==
 +
{{Specs-Avia-Armaments}}
 
=== Offensive armament ===
 
=== Offensive armament ===
 +
{{Specs-Avia-Offensive}}
 
<!-- ''Describe the offensive armament of the aircraft, if any. Describe how effective the cannons and machine guns are in a battle, and also what belts or drums are better to use. If there is no offensive weaponry, delete this subsection.'' -->
 
<!-- ''Describe the offensive armament of the aircraft, if any. Describe how effective the cannons and machine guns are in a battle, and also what belts or drums are better to use. If there is no offensive weaponry, delete this subsection.'' -->
 +
 
{{main|Akan m/45 (20 mm)|Akan m/39A (13.2 mm)}}
 
{{main|Akan m/45 (20 mm)|Akan m/39A (13.2 mm)}}
  
Line 76: Line 99:
  
 
* 1 x 20 mm Akan m/45 cannon, nose-mounted (140 rpg)
 
* 1 x 20 mm Akan m/45 cannon, nose-mounted (140 rpg)
−
* 4 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, nose-mounted (350 rpg = 700 total)
−
* 4 x 13.2 mm Akan m/39A machine guns, wing-mounted (325 rpg = 650 total)
+
* 2 x 13.2 mm Akan m/39A machine guns, wing-mounted (325 rpg = 650 total)
  
 
== Usage in battles ==
 
== 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).'' -->
 
<!-- ''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).'' -->
  
−
The J21A-2 (along with the rest of the J21A variants) is an excellent energy fighter. The plane retains and gains speed very well, as long as it is flying in a straight line. In level flight or in a dive, the J21A is very fast and can outrun most of its opponents. Additionally, it can manoeuvre quite well compared to some of its opponents but pilots must watch to ensure their speed does not drop too low as this makes the J21A an easy target. The nose mounted armament makes it possible to successfully fight head-on with opponents and the 20 mm cannon is especially devastating when combined with the 13.2 mm machine guns. This armament also makes the J21A good as a bomber-interceptor since it can knock out critical components of an opponent's aircraft very quickly.
+
The J21A-2 (along with the rest of the J21A variants) is an excellent energy fighter. The plane retains and gains speed very well, as long as it is flying in a straight line. In level flight or in a dive, the J21A is very fast and can outrun most of its opponents. Additionally, it can maneuver quite well compared to some of its opponents but pilots must watch to ensure their speed does not drop too low as this makes the J21A an easy target. The nose-mounted armament makes it possible to successfully fight head-on with opponents and the 20 mm cannon is especially devastating when combined with the 13.2 mm machine guns. This armament also makes the J21A good as a bomber-interceptor since it can knock out critical components of an opponent's aircraft very quickly.
  
−
Overall, the J21A was designed (and should be used) as an interceptor. One excellent tactic is to climb at about 20 degrees until reaching 4000-5000 meters and operating from that altitude in a boom-and-zoom role. This enables the J21A to use its excellent dive speed and heavy armament to maximum effect.
+
Overall, the J21A was designed (and should be used) as an interceptor. One excellent tactic is to climb at about 20 degrees until reaching 4,000-5,000 m and operating from that altitude in a boom-and-zoom role. This enables the J21A to use its excellent dive speed and heavy armament to maximum effect.
  
−
Another effective tactic is to fly level and fast at medium altitude 2000-3000 meters and act as a support fighter, assisting team mates who are overwhelmed by picking off some of their opponents in hit-and-run attacks. While the J21 can manoeuvre quite well (especially with combat flaps) it is not advisable to do this except as a last resort because the aircraft bleeds speed very rapidly. Also, this can expose the J21's engine (mounted in the rear of the aircraft) to and an enemy, allowing him the opportunity to knock out the J21's engine or hit its fuel tank (centrally located between the cockpit and the engine). This is another reason to avoid running away from an opponent, except when you can dive faster than the enemy or outclimb him. Many planes at the J21's level can keep up with it, although many also cannot. As long as you know your opponent and their capabilities, you can use the J21 very effectively.
+
Another effective tactic is to fly level and fast at medium altitude 2,000-3,000 m and act as a support fighter, assisting team mates who are overwhelmed by picking off some of their opponents in hit-and-run attacks. While the J21 can maneuver quite well (especially with combat flaps) it is not advisable to do this except as a last resort because the aircraft bleeds speed very rapidly. Also, this can expose the J21's engine (mounted in the rear of the aircraft) to and an enemy, allowing him the opportunity to knock out the J21's engine or hit its fuel tank (centrally located between the cockpit and the engine). This is another reason to avoid running away from an opponent, except when you can dive faster than the enemy or outclimb him. Many planes at the J21's level can keep up with it, although many also cannot. As long as you know your opponent and their capabilities, you can use the J21 very effectively.
  
 
Although the J21 can be set on fire rather easily due to its centrally located fuel tank, it is often possible to put out the fire by diving very steeply and fast. This creates enough of a slipstream around the fuselage to often put out the fire.
 
Although the J21 can be set on fire rather easily due to its centrally located fuel tank, it is often possible to put out the fire by diving very steeply and fast. This creates enough of a slipstream around the fuselage to often put out the fire.
 +
 +
A enemy worth noting is the F-82E which is equipped with 6 12.7 mm M3 Browning machine guns which could provide a formidable foe that could take out the J21A quickly with just a few bursts, and its payload is superior to the J21 variants, which could result in a quick death when going head on with one.
  
 
=== Manual Engine Control ===
 
=== Manual Engine Control ===
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|-
 
|-
 
|}
 
|}
−
 
−
=== Modules ===
 
−
{| class="wikitable"
 
−
! Tier
 
−
! colspan="2" | Flight performance
 
−
! Survivability
 
−
! colspan="2" | 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
 
−
|-
 
−
|}
 
−
[[File:J21A-2 flying over a body of water.jpg|thumb|A21A-3 flying]]
 
  
 
=== Pros and cons ===
 
=== Pros and cons ===
Line 150: Line 137:
 
'''Pros:'''
 
'''Pros:'''
  
−
* Very stable, does not stall in level flight even with the throttle set to zero
+
* Heavy armament with excellent ammunition belts, with most of it being nose-mounted
 
* Retains controllability at all speeds, even when stalling
 
* Retains controllability at all speeds, even when stalling
−
* Engine protected from head-on attacks
+
* Can pull high AoA for quick snapshots
−
* Most armament is nose-mounted
 
−
* Heavy armament with excellent ammunition belts
 
  
 
'''Cons:'''
 
'''Cons:'''
  
−
* Pusher aircraft, engine mounted facing rear, exposed to enemy aircraft which may follow
+
* Loses energy rapidly in sharp turns
−
* Required to set convergence due to wing-mounted machine guns
+
* Engine overheats during takeoff and during flight at WEP even with full modifications
−
* Loses speed rapidly in sharp turns
+
* Very low rip speed - cannot push past 640 km/h (400 mph) without threatening to rip off wings
−
* Long weapon reload time (in AB)
 
−
* High repair cost
 
  
 
== History ==
 
== History ==
−
''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 long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).''
+
<!-- ''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 long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).'' -->
 +
The J21A-2 was a variant of the Saab 21, a twin-boom propeller fighter used by the Swedish air force. A unique design, it had a pusher-configuration engine and a twin-boom tail, giving it a very unique appearance. The J21A-2 was the second production variant of the J21 fighter, featuring a Swedish-built 20 mm cannon along with numerous other refinements. A total of 124 J-21A-2 aircraft were built in two batches; these aircraft served as the mainline Swedish fighter until the introduction of more capable jet-engined fighters.
 +
 
 +
In the early 1940s, it was apparent that Sweden badly needed a new fighter aircraft. Thus, Sweden ordered SAAB to design a new aircraft based on the German Daimler-Benz DB 601, 603 or 605 engine. At that time, the German and Swedish had a series of neutrality agreements, allowing Sweden to import the German-made aircraft engines. One radical configuration considered was a twin-boom aircraft, similar to the P-38 Lightning, but with a single rear-mounted engine in pusher configuration. However, SAAB was initially asked to instead produce the J23, a more conventional aircraft design.
 +
 
 +
In late 1941, the Swedish air ministry reverted to its previous decision and asked the SAAB firm to produce the J21 design. Thus, design work progressed through 1942 and 1943. The final prototype featured a twin-boom wing with a single DB-605B engine, and carried a main armament of one 20 mm cannon along with four 13.2 mm heavy machine guns. The first prototype flew in mid-1943, but was quickly revealed to have inferior performance to the Fw 190, Spitfire and P-51 Mustang. However, 484 aircraft were ordered anyway.
 +
 
 +
The first of these aircraft, named J21A-1, entered service in 1945 with a total of 54 aircraft built. The J21A-2 was a later version that entered service in 1946-1947, with 66 aircraft built in two batches for a total of 124 aircraft. The J21A-2 featured numerous minor improvements compared to the J21A-1, including the installation of a Swedish 20 mm cannon and better avionics.
 +
 
 +
The J21A-2 entered service in 1947, but had an extremely short service life. The aircraft's poor performance and relative obsolescence meant that it served for an extremely short time. The 124 aircraft built were quickly replaced by the more modern J29 Tunnan and British de Havilland Vampire, leading to the aircraft's retirement by 1954. However, it is worth noting that SAAB also experimented with coupling a jet engine to the J21 airframe; this resulted in the A21RB, a unique aircraft coupling the J21's fuselage with a de Havilland Ghost engine. No J21A-2 airframes still exist but three J21A-3 aircraft still exist in museums today.
  
 
== Media ==
 
== Media ==
−
''Excellent additions to the article would be video guides, screenshots from the game, and photos.''
+
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
 +
 
 +
;Skins
 +
 
 +
* [https://live.warthunder.com/feed/camouflages/?vehicle=saab_j21a_2 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
 +
 
 +
;Videos
 +
 
 +
*{{Youtube-gallery|EO3s2xJMtjE| '''SIMPLY the BEST! J21A-2 - Sweden - Review!'''  - ''Jengar''}}
  
 
== See also ==
 
== See also ==
−
''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
+
<!-- ''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.'' -->
 +
 
 +
;Related Development
 +
 
 +
*[[J21 (Family)]]
 +
 
 +
;Similar Roles
  
−
* ''reference to the series of the aircraft;''
+
* [[S.O.8000 Narval]]
−
* ''links to approximate analogues of other nations and research trees.''
 
  
 
== External links ==
 
== External links ==
−
''Paste links to sources and external resources, such as:''
+
<!-- ''Paste links to sources and external resources, such as:''
 +
* ''topic on the official game forum;''
 +
* ''other literature.'' -->
  
−
* ''topic on the official game forum;''
+
* [https://forum.warthunder.com/index.php?/topic/474726-saab-j21a-1/ Official data sheet - more details about the performance]
−
* ''encyclopedia page on the aircraft;''
 
−
* ''other literature.''
 
  
 
{{AirManufacturer Saab}}
 
{{AirManufacturer Saab}}
 
{{Sweden fighters}}
 
{{Sweden fighters}}

Latest revision as of 22:32, 6 November 2024

Introducing Wiki 3.0
This page is about the Swedish fighter J21A-2. For other versions, see J21 (Family).
J21A-2
saab_j21a_2.png
GarageImage J21A-2.jpg
360://https://old-wiki.warthunder.com/images/b/bb/Cockpit_saab_j21a_2.jpg
J21A-2
Sweden flag.png Sweden
IV Rank
Battle rating:
AB RB SB
5.3 4.3 3.7
Class:
Research:27 000 Specs-Card-Exp.png
Purchase:185 000 Specs-Card-Lion.png

Description

The J21A-2 was the second production series and an improved version of the J21A-1 (though performance was improved, the J21 was still an obsolete aircraft at its time). The only differences between the A-1 and A-2 were a separated centre wing flap for the fuselage, and new cooling fins around the engine for the liquid and oil coolers.

Introduced in Update 1.95 "Northern Wind", the J21A-2 has a similar playstyle as the J21A-1 and keeps the similar firepower, except the 20 mm Akan m/41A has been replaced with a Bofors 20 mm Akan m/45. Due to the minimal changes, the J21A-2 keeps the same flight model and performance as the earlier version.

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
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

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
  • Engine fire system (EFS)

Modifications and economy

Repair costBasic → Reference
AB2 322 → 3 169 Sl icon.png
RB5 063 → 6 910 Sl icon.png
SB6 754 → 9 219 Sl icon.png
Total cost of modifications46 700 Rp icon.png
84 900 Sl icon.png
Talisman cost1 500 Ge icon.png
Crew training52 000 Sl icon.png
Experts185 000 Sl icon.png
Aces940 Ge icon.png
Research Aces480 000 Rp icon.png
Reward for battleAB / RB / SB
90 / 220 / 460 % Sl icon.png
166 / 166 / 166 % Rp icon.png
Modifications
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
Research:
3 100 Rp icon.png
Cost:
5 600 Sl icon.png
200 Ge icon.png
Mods radiator.png
Radiator
Research:
3 100 Rp icon.png
Cost:
5 600 Sl icon.png
200 Ge icon.png
Mods armor frame.png
Airframe
Research:
3 500 Rp icon.png
Cost:
6 400 Sl icon.png
230 Ge icon.png
Mods compressor.png
Compressor
Research:
3 500 Rp icon.png
Cost:
6 400 Sl icon.png
230 Ge icon.png
Mods aerodinamic wing.png
Wings repair
Research:
3 900 Rp icon.png
Cost:
7 100 Sl icon.png
250 Ge icon.png
Mods new engine.png
Engine
Research:
3 900 Rp icon.png
Cost:
7 100 Sl icon.png
250 Ge icon.png
Mods armor cover.png
Cover
Research:
3 800 Rp icon.png
Cost:
6 900 Sl icon.png
250 Ge icon.png
Mods metanol.png
Engine injection
Research:
3 800 Rp icon.png
Cost:
6 900 Sl icon.png
250 Ge icon.png
Mods engine extinguisher.png
EFS
Research:
3 800 Rp icon.png
Cost:
6 900 Sl icon.png
250 Ge icon.png
Mods ammo.png
akan_m47_belt_pack
Research:
3 100 Rp icon.png
Cost:
5 600 Sl icon.png
200 Ge icon.png
Mod arrow 1.png
Mods ammo.png
13_2_akan_m39_belt_pack
Research:
3 500 Rp icon.png
Cost:
6 400 Sl icon.png
230 Ge icon.png
Mod arrow 1.png
Mods weapon.png
akan_m47_new_gun
Research:
3 900 Rp icon.png
Cost:
7 100 Sl icon.png
250 Ge icon.png
Mods weapon.png
13_2_akan_m39_new_gun
Research:
3 800 Rp icon.png
Cost:
6 900 Sl icon.png
250 Ge icon.png

Armaments

Offensive armament

Weapon 120 mm Akan m/45 cannon
Ammunition140 rounds
Fire rate725 shots/min
Weapon 24 x 13.2 mm Akan m/39A machine gun
Ammunition1 350 rounds
Fire rate1 080 shots/min
Main articles: Akan m/45 (20 mm), Akan m/39A (13.2 mm)

The J21A-2 is armed with:

  • 1 x 20 mm Akan m/45 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)

Usage in battles

The J21A-2 (along with the rest of the J21A variants) is an excellent energy fighter. The plane retains and gains speed very well, as long as it is flying in a straight line. In level flight or in a dive, the J21A is very fast and can outrun most of its opponents. Additionally, it can maneuver quite well compared to some of its opponents but pilots must watch to ensure their speed does not drop too low as this makes the J21A an easy target. The nose-mounted armament makes it possible to successfully fight head-on with opponents and the 20 mm cannon is especially devastating when combined with the 13.2 mm machine guns. This armament also makes the J21A good as a bomber-interceptor since it can knock out critical components of an opponent's aircraft very quickly.

Overall, the J21A was designed (and should be used) as an interceptor. One excellent tactic is to climb at about 20 degrees until reaching 4,000-5,000 m and operating from that altitude in a boom-and-zoom role. This enables the J21A to use its excellent dive speed and heavy armament to maximum effect.

Another effective tactic is to fly level and fast at medium altitude 2,000-3,000 m and act as a support fighter, assisting team mates who are overwhelmed by picking off some of their opponents in hit-and-run attacks. While the J21 can maneuver quite well (especially with combat flaps) it is not advisable to do this except as a last resort because the aircraft bleeds speed very rapidly. Also, this can expose the J21's engine (mounted in the rear of the aircraft) to and an enemy, allowing him the opportunity to knock out the J21's engine or hit its fuel tank (centrally located between the cockpit and the engine). This is another reason to avoid running away from an opponent, except when you can dive faster than the enemy or outclimb him. Many planes at the J21's level can keep up with it, although many also cannot. As long as you know your opponent and their capabilities, you can use the J21 very effectively.

Although the J21 can be set on fire rather easily due to its centrally located fuel tank, it is often possible to put out the fire by diving very steeply and fast. This creates enough of a slipstream around the fuselage to often put out the fire.

A enemy worth noting is the F-82E which is equipped with 6 12.7 mm M3 Browning machine guns which could provide a formidable foe that could take out the J21A quickly with just a few bursts, and its payload is superior to the J21 variants, which could result in a quick death when going head on with one.

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:

  • Heavy armament with excellent ammunition belts, with most of it being nose-mounted
  • Retains controllability at all speeds, even when stalling
  • Can pull high AoA for quick snapshots

Cons:

  • Loses energy rapidly in sharp turns
  • 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 J21A-2 was a variant of the Saab 21, a twin-boom propeller fighter used by the Swedish air force. A unique design, it had a pusher-configuration engine and a twin-boom tail, giving it a very unique appearance. The J21A-2 was the second production variant of the J21 fighter, featuring a Swedish-built 20 mm cannon along with numerous other refinements. A total of 124 J-21A-2 aircraft were built in two batches; these aircraft served as the mainline Swedish fighter until the introduction of more capable jet-engined fighters.

In the early 1940s, it was apparent that Sweden badly needed a new fighter aircraft. Thus, Sweden ordered SAAB to design a new aircraft based on the German Daimler-Benz DB 601, 603 or 605 engine. At that time, the German and Swedish had a series of neutrality agreements, allowing Sweden to import the German-made aircraft engines. One radical configuration considered was a twin-boom aircraft, similar to the P-38 Lightning, but with a single rear-mounted engine in pusher configuration. However, SAAB was initially asked to instead produce the J23, a more conventional aircraft design.

In late 1941, the Swedish air ministry reverted to its previous decision and asked the SAAB firm to produce the J21 design. Thus, design work progressed through 1942 and 1943. The final prototype featured a twin-boom wing with a single DB-605B engine, and carried a main armament of one 20 mm cannon along with four 13.2 mm heavy machine guns. The first prototype flew in mid-1943, but was quickly revealed to have inferior performance to the Fw 190, Spitfire and P-51 Mustang. However, 484 aircraft were ordered anyway.

The first of these aircraft, named J21A-1, entered service in 1945 with a total of 54 aircraft built. The J21A-2 was a later version that entered service in 1946-1947, with 66 aircraft built in two batches for a total of 124 aircraft. The J21A-2 featured numerous minor improvements compared to the J21A-1, including the installation of a Swedish 20 mm cannon and better avionics.

The J21A-2 entered service in 1947, but had an extremely short service life. The aircraft's poor performance and relative obsolescence meant that it served for an extremely short time. The 124 aircraft built were quickly replaced by the more modern J29 Tunnan and British de Havilland Vampire, leading to the aircraft's retirement by 1954. However, it is worth noting that SAAB also experimented with coupling a jet engine to the J21 airframe; this resulted in the A21RB, a unique aircraft coupling the J21's fuselage with a de Havilland Ghost engine. No J21A-2 airframes still exist but three J21A-3 aircraft still exist in museums today.

Media

Skins
Videos
  • SIMPLY the BEST! J21A-2 - Sweden - Review! - Jengar

See also

Related Development
Similar Roles

External links


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

Sweden fighters
ASJA  J6B
Saab  J21A-1 · J21A-2 · A21A-3
FFVS  J22-A · J22-B
Foreign Import  J8A · Iacobi's J8A · J9 Early · J11 · J20 · J26 David · J26
Finland 
VL  Mörkö-Morane · VL Myrsky II · VL Pyörremyrsky
(NL) Fokker  ▄Fokker D.XXI-3 · ▄Fokker D.XXI
(DE) Messerschmitt  ▄Bf 109 G-2 · ▄Bf 109 G-6 Erla · ▄Bf 109 G-6
Other  ▄B-239 · ▄Hurricane Mk I/L

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