
Yes it is nice eh?
Number Delivery In service
made
J 21A-1 54 1945-46 -1949
J 21A-2 62 1946-47 -1953 Improved avionics. Swedish made 20 mm gun.
J 21A-2 62 1947-47 -1954
A 21A-3 60 1947-48 -1954 Primarily intended for ground attack.
A 21A-3 60 1948-49 -1954
Saab wanted to gain experience with jet engines, and decided in 1945 to convert a few J 21A-1s to jet power powered with de Havilland Goblin 2 engines which were ordered from Enland.
The aircraft to be converted were taken from the assembly line before they were finished. Optimistically it was thought only 20% needed to be redesigned, but closer to 50% had to be changed. First prototype flew in 1947 March 10.
The main aerodynamic differences were the the tailplane were moved up to get away from the exhaust and the wing leading edge moved forward and made sharper. A totally new wing was cancelled on cost grounds.
The air force planned to order 120 but only 60 were ordered in 1947.
Number Delivery In service
made
(J)A 21RA 30 1950-50 -1953 English made engine
(J)A 21RB 30 1950-52 -1956 Swedish made engine
"Ammunition clearance is a science with uncertain assumptions, based on disputed calculations. Derived from none convincing experiments carried out by persons with doubtful reliability and questioned mental capacities using instrument of doubtful precision".