Revised nose profile/

nose gear cover

Revised, squarer

fin shape

1 x 13.2 mm (.52 in) m/39

machine gun with 310

rounds per gun in each

tail boom

2 x 13.2 mm (.52 in) m/39 machine

guns with 325 rounds per gun,

1 x 20 mm (.79 in) Bofors m/41A

cannon with 130 rounds

Provision for centreline ventral gunpack

400 lt (88 Imp gal, 106 US gal)

wingtip tanks

J(A)21RA – with RM1 (de Havilland

Goblin 2) centrifugal flow jet engine;

J(A)21RB – with RM1A (de Havilland

Goblin 3) centrifugal flow jet engine

Jet-powered version, details as J21

prototype unless otherwise indicated

New rear engine section to accommodate Goblin engine

Tailplane raised above jet efflux

New, larger intakes

Radiators deleted, replaced by additional fuel tanks

Strengthened tail structure

K-14 automatic gun sight

Pitot moved

to port wing

Wing flaps, no centre

fuselage flap

Bulbous engine fairing

Revised elevator

with single trim tab

Exhaust

Main undercarriage units moved

further forward by 200 mm

(7.87 in), up by 300 mm (11.8 in)

and angled forwards

Airbrakes above

and below wing

Revised cockpit layout/

instruments

New hydraulic pump and

pressurised air system

Leading edge

extended forward

Revised nose profile/

nose gear cover

Revised, squarer

fin shape

1 x 13.2 mm (.52 in) m/39

machine gun with 310

rounds per gun in each

tail boom

2 x 13.2 mm (.52 in) m/39 machine

guns with 325 rounds per gun, 1 x

20 mm (.79 in) Hispano-Suiza m/41A

cannon with 130 rounds

Gun camera

400 lt (88 Imp gal, 106 US gal)

wingtip tanks ((A)21A-3)

J21A-1 (shown);

J21A-2 – revised centre under

fuselage flap, armament all

produced by Bofors (1 x 20 mm

(.79 in) Bofors m/45 cannon

with 130 rounds);

J(A)21A-3 – attack version

with hardpoints on centreline

and under outer wings for

rockets and bombs, also

wingtip tanks (shown)

Production version, details as J21

prototype unless otherwise indicated

Centre under fuselage flap

split into three sections at rear

Tail boom incorporating main landing gear unit

Tricycle undercarriage nose gear

unit in lower forward wheel well

SAAB Mk.1 ejector seat

Three-bladed pusher propeller

faired into streamlined fuselage

Rounded fin with

large rudder

Exhaust stacks (port/starboard)

Starboard side intake

Bulged side canopy panels

Radio antenna on

starboard boom

Retractable boarding ladder on lower starboard side