Hispano HSS 825 guns. One J 29A (number 29137) trialed with 30 mm HSS 825 mockups in 1952. After trestle mount trials of the 30 mm HSS 825 in 1954 it was found that the weapon was unsafe and the idea to use it on the J 29D was scrapped. A single J 29D prototype was built to test the afterburning Ghost RM 2A turbojet with 27.5 kN (2,800 kgp/6,175 lbf) afterburning thrust. Ultimately converted to J 29 F standard. J 29E Fighter, 29 built in 1955; introduced an improved wing design with a leading edge dogtooth to increase the critical Mach number. J 29F Fighter, 308 aircraft converted from available stocks of B and E model airframes from 1954 to 1956; featured the afterburning Ghost and dog-tooth wing; all remaining aircraft were further modified in 1963 to carry a pair of US-designed AIM-9B Sidewinder heat-seeking air-to-air missiles, built by SAAB under license as the Rb 24. J 29F (2. JaBoStaffel variant) Reconnaissance modification for Austrian J 29F's serving with 2. JaBoStaffel. The modification allowed for the replacement of the left side guns with cameras in a green housing. Operators Austrian Air Force 1. JaBoStaffel (1st fighter-bomber-squadron) 2. JaBoStaffel (2nd fighter-bomber-squadron) Swedish Air Force F 3 Malmslätt F 4 Frösön F 6 Karlsborg F 7 Såtenäs F 8 Barkarby F 9 Säve F 10 Ängelholm F 11 Nyköping F 12 Kalmar F 13 Norrköping F 15 Söderhamn F 16 Uppsala F 21 Luleå ONUC Swedish Air Force F 22 Congo Surviving aircraft J 29F 29624 displayed at the Aeroseum in a cavern at Gothenburg/Säve airport. J 29F 29640 preserved at Midlands Air Museum, Coventry, UK J 29F 29665 at the Musée de l'Air located at the former Paris–Le Bourget Airport in France. J 29F 29566 on display at the Museum of Military History in Vienna, Austria Specifications (Saab J 29F Tunnan) See also References Citations Bibliography Berns, Lennart and Robin Lindholm. "Saab J 29 Tunnan". International Air Power Review, volume 13/2004, pp. 152–73. Boyne, Walter J. Air Warfare: An International Encyclopedia, Volume 1. ABC-CLIO, 2002. . Erichs, Rolph et al. The Saab-Scania Story. Stockholm: Streiffert & Co., 1988. . Green, William and Gordon Swanborough. The Great Book of Fighters. St. Paul, MAN: MBI Publishing, 2001. . Lombardi, Fiona. The Swiss Air Power: Wherefrom? Whereto? vdf Hochschulverlag AG, 2007. . "Saab-29: Sweden's new jet fighter." Flight International, 4 May 1950. pp.