The Saab 29 Tunnan, colloquially also Flygande Tunnan, is an early jet-powered fighter aircraft designed and produced by the Swedish aircraft manufacturer Saab. It was the second turbojet-powered combat aircraft to be developed in Sweden, the first being the Saab 21R, and it was the first Western European fighter to be produced with a swept wing after the Second World War, only being preceded in Western Europe as a whole by the Messerschmitt Me 262 built during the conflict.
Work on what would become the Tunnan commenced in late 1945. The design, internally designated R 1001, had a barrel-like fuselage, giving it a distinctive rotund appearance, from which its name is derived. A relatively thin swept wing configuration was adopted after wartime aerodynamic research from Germany indicated its favourable high speed qualities.
Wikipedia https://en.wikipedia.org/wiki/Saab_29_Tunnan
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Coordinates 48°18'22.622" N 14°18'40.757" E