Saab 29 Tunnan

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.

Source: Wikipedia