The retrofit Goburinjettoenjin propelled propeller fighter first flew in 1943, the first model of the Swedish fighter jet and made improvements to increase the mounting position of the horizontal stabilizer.
Successful first flight next year in 1947, more advanced J-29 for the successful development of Teyunan,
Exit 60 aircraft deployed in production.
Vier uitvoeringen mogelijk;
- Saab J-21R - Swedish Air Force - "Red N", Wing F7, Sätenas, 1952.
- Saab J-21R - Swedish Air Force - "Blue D", Wing F10, Ängelholm, 1950.
- Saab J-21R - Swedish Air Force - "Red N". staat nu in het luchtvaart museum in Linköpeng. (The machine is J-21R converted to A-21R).
- Saab J-21R - Swedish Air Force - "Blue "Ö"", Wing F7, Sätenas, 1953-1954.
