SAAB 21

Specifications

1st Flight 1943

Crew: 1

Length: 10.45 m (34 ft 3 in)

Wingspan: 11.6 m (38 ft 1 in)

Height: 3.97 m (13 ft 0 in)

Wing area: 22.2 m2 (239 sq ft)

Airfoil: Saab laminar airfoil

Empty weight: 3,250 kg (7,165 lb)

Gross weight: 4,150 kg (9,149 lb)

Max takeoff weight: 5,200 kg (11,464 lb)

Fuel capacity: 510 l (130 US gal; 110 imp gal) internal

2x 160 l (42 US gal; 35 imp gal) drop tanksJ 21A-1 & J 21A-2 

2x 400 l (110 US gal; 88 imp gal) drop tanks J(A) 21A-3

Powerplant: 1 × Daimler-Benz DB 605B, built by SFA. V-12 inverted liquid-cooled piston engine, 1,085 kW (1,455 hp)

Propellers: 3-bladed constant-speed pusher propeller

Performance

Maximum speed: 650 km/h (400 mph, 350 kn) J 21A-1 / J 21A-2

560 km/h (350 mph; 300 kn) J(A) 21A-3

Cruise speed: 495 km/h (308 mph, 267 kn) J 21A-1 / J 21A-2

425 km/h (264 mph; 229 kn) J(A) 21A-3

Landing speed: 145 km/h (90 mph; 78 kn)

Range: 750 km (470 mi, 400 nmi)

Ferry range: 1,190 km (740 mi, 640 nmi) J 21A-1 / J 21A-2

1,650 km (1,030 mi; 890 nmi) J(A) 21A-3

Service ceiling: 10,200 m (33,500 ft) J 21A-1 / J 21A-2

7,500 m (24,606 ft) J(A) 21A-3

Rate of climb: 15 m/s (3,000 ft/min)

Armament

Guns

J 21A-1

1× 20 mm (0.79 in) akan m/41A with 60 rounds in the nose

2x 13.2 mm (0.52 in) akan m/39A with 350 rpg in the nose

2x 13.2 mm (0.52 in) akan m/39A with 325 rpg in the wings

J 21A-2 & A-3

1× 20 mm (0.79 in) akan m/45 with 140 rounds in the nose

2x 13.2 mm (0.52 in) akan m/39A with 350 rpg in the nose

2x 13.2 mm (0.52 in) akan m/39A with 325 rpg in the wings

J(A) 21A-3 700 kg (1,543 lb) maximum

Inner wing mount

(the inner wing mount was only used for rockets until the outer racks were developed)

4x 50 kg (110 lb) minbomb m/37 general-purpose bombs, or sprängbomb m/42 or m/47 fragmentation bombs or bombkapsel m/43 cluster bombs

4x 8 cm (3.1 in) pansarraket m/46 Armour-piercing RP-3 rocket

4x 15 cm (5.9 in) sprängraket m/46 High-explosive semi-armour-piercing (SAP) RP-3 rocket

Outer wing mount

8x 8 cm (3.1 in) pansarraket m/46 Armour-piercing RP-3 rocket

8x 14.5 cm (5.7 in) Bofors pansarsprängraket m/49A & B High explosive anti-tank (HEAT) rocket

8x 15 cm (5.9 in) sprängraket m/46 High-explosive semi-armour-piercing RP-3 rocket or Bofors sprängraket m/51A & B high-explosive rocket

2x 18 cm (7.1 in) Bofors halvpansarraket m/49A & B Armour-piercing high-explosive anti-ship rocket (later used against general targets.)

Belly

1x 250 kg (550 lb) minbomb m/37 general-purpose bomb

1x 250 kg (550 lb) minbomb m/40 general-purpose bomb

1x 250 kg (550 lb) minbomb m/50 general-purpose bomb

1x 500 kg (1,100 lb) minbomb m/41 general-purpose bomb

1x 600 kg (1,300 lb) minbomb m/50 general-purpose bomb

Wingtips

2x vingspetstank drop tanks which could be armed in flight as incendiary bombs, and were tested with napalm.

Variants

J 21A-1

First production series of fighter version. 54 built between 1945 and 1946, retired in 1949.

J 21A-2

Second and third production series of fighter version (62 aircraft each built between 1946 and 1947). Aircraft had better avionics and was armed with a Swedish 20 mm (0.79 in) gun. Retired between 1953 and 1954.

J 21A-3 (later designated A 21A)

First and second production series of attack version (66 aircraft each built between 1947 and 1949). Aircraft was a J 21A-2 equipped with a bomb aiming sight and had pylons for bombs and rockets. It was later upgraded to be able to use two RATO rockets.

J 21B

Planned version armed with three 20 mm (0.79 in) nose guns, radar in the starboard boom, improved aerodynamics, P-51 style bubble canopy and a stronger engine. Suggested engines were at first the Daimler-Benz DB 605E or the Rolls-Royce Griffon engine but due to the end of the war Germany could not deliver the DB-605E and the British had not yet finished the development of the Griffon engine. It was then decided to use the Swedish DB-605B engine modified to 1700 hp. A full scale mockup was built but due to the jet age the project was scrapped at the end of 1945 due to the Saab 29 project. None built.

Share on facebook

Share on facebook