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Saab J21


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Eyeless_Camper #1 Posted 20 February 2012 - 04:34 PM

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The SAAB 21 was a Swedish fighter/attack aircraft from SAAB that first took to the air in 1943. It was described as a very efficient weapons platform. It was designed as a twin boom pusher configuration, where the propeller is mounted in the rear of the fuselage, pushing the aircraft forward.

The unorthodox SAAB J 21 fighter was a domestic attempt to provide the Swedish Air Force with a true high performance fighter.

In 1941 SAABs designer Frid Wänström presented the Air Force with concept of a fighter plane powered by a Daimler Benz liquid-cooled V-12 engine. Wänström proposed a push-propeller layout and a tricycle undercarriage. This configuration was expected to have several important advantages - excellent forward visibility, heavy armament concentrated in the fuselage, good landing characteristics.

At the same time the Air Force arranged for purchase and license production of Daimler Benz engines from Germany. This finally resulted in the purchase of  eighty-plus DB 605B engines of 1475 hp in 1943 and a contract for license production.

The J 21 emerged as a very advanced airframe with streamlined shape, twin tail booms, laminar wing profile and ejection seat for the pilot  (which actually worked well in service, unlike some of the early ejection seat designs of German Luftwaffe). The first of the three prototypes made it's maiden flight in July 1943.

The J 21 were not without problems. Because of the propeller's placement, engine cooling proved to be inadequate, especially on the ground - a serious problem that was never really worked out.
It also proved to be a good gun platform and was easy to start and land.

In 1946, SAAB converted the J21 to jet propulsion, installing the de Havilland Goblin instead of the DB 605. This new version was put into production as J21R. Thus the J21 became one of only two propeller-driven aircraft in the world that were successfully converted and produced as jets (the other one being Yak-3).


Specifications (Saab 21A-3)

General characteristics

Crew: 1
Length: 10.45 m (34 ft 3 in)
Wingspan: 11.6 m (38 ft 0 in)
Height: 3.97 (13 ft 0 in)
Wing area: 22.2 m² (238.87 ft²)
Empty weight: 3,250 kg (7,165 lb)
Loaded weight: 4,150 kg (9,149 lb)
Max. takeoff weight: 4,413 kg (9,730 lb)
Powerplant: 1 × Daimler-Benz DB 605B, built by SFA. liquid-cooled, supercharged, 60° inverted V12 engine, 1,085 kW (1,455 hp / 1,475 PS)

Performance

Maximum speed: 640 km/h (343 knots, 398 mph)
Cruise speed: 495 km/h (265 knots, 308 mph)
Range: 750 km (466 mi)
Service ceiling: 11,000 m (36,090 ft)
Rate of climb: 15 m/s (2,950 ft/min)

Armament

1× 20 mm Hispano-Suiza HS.404 or Bofors cannon
2× 13 mm Bofors-built Colt machine guns in the nose
2× 13 mm Bofors-built Colt machine guns in the wing
700 kg bomb load or 8 rocket projectiles

Posted Image


--The Eyeless_Camper

"When you shoot at a destroyer and miss, it's like hit'in a wildcat in the a** with a banjo”
-Chief Officer Steward Dogan on the USS Gurnard


commando2227 #2 Posted 20 February 2012 - 10:38 PM

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What was the performance with the deHavilland Goblin?



WoWp drinking game: Drink when a post about being accepted into CBT,how Brit/Japanese planes should be added,about why no beta key yet, a thread that should be in beta section is in open section or how something should be added when devs have said no.

Eyeless_Camper #3 Posted 20 February 2012 - 11:00 PM

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General characteristics
Crew: One
Length: 10.45 m (34 ft 3 in)
Wingspan: 11.37 m (37 ft 4 in)
Height: 2.90 m (9 ft 8 in)
Empty weight: 3,200 kg (7,055 lb)
Max. takeoff weight: 5,000 kg (11,023 lb)
Powerplant: 1 × de Havilland Goblin 2 turbojet, 13.8 kN (3,100 lbf)
Performance
Maximum speed: 800 km/h (497 mph)
Range: 720 km (450 mi)
Service ceiling: 12,000 m (39,400 ft)
Takeoff roll: 650 m (2,133 ft)
Armament
1x 20 mm Bofors Cannon
4x 13.2 mm M/39A Heavy machine guns
Centerline pod for an additional 8x 13.2 mm M/39A Heavy machine guns
Wing racks for either: 10x 100 mm or 5x 180 mm Bofors rockets, or 10x 80 mm anti-tank rockets.  :) with the Jet engine :P

"When you shoot at a destroyer and miss, it's like hit'in a wildcat in the a** with a banjo”
-Chief Officer Steward Dogan on the USS Gurnard


Goodse #4 Posted 21 February 2012 - 05:07 AM

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This looks like a really interesting plane, and I do want to see ugly planes in this (not saying this one is ugly) but especially 1941-1942 was the main time abstract planes were created.  :Smile_playing:

Mitsosk #5 Posted 26 February 2012 - 07:32 AM

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Very interesting aircraft and definetely viable option for inclunsion in WoWp roster.