The Saab 29 Tunnan, also known as the "Flying Barrel", is a Swedish fighter aircraft produced by Saab between 1948 and 1956. The Tunnan was designed as a short-range interceptor and was the first supersonic aircraft to be produced by Saab. The Tunnan was designed to replace the World War II era Saab 21 and was the first aircraft produced by the company after the war.

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The Tunnan was designed with an emphasis on speed and maneuverability, giving it an advantage in air-to-air combat over slower aircraft. To achieve this, Saab utilized an innovative design that used a unique swept-wing design and a powerful turbojet engine. The swept-wing design allowed the Tunnan to achieve greater speeds and better maneuverability than a normal straight-wing design. The turbojet engine provided the aircraft with a thrust-to-weight ratio that was higher than any other fighter aircraft of the time.

The Tunnan was an immediate success and served in the Swedish Air Force for over 10 years. It was also exported to other countries, including Austria, Denmark, Finland, Venezuela, and West Germany. Over 1,400 Tunnans were produced and they remain in active service with several air forces around the world.

Despite its success, the Tunnan has had some issues with safety. In the 1950s, several Tunnans crashed due to engine failure, resulting in the deaths of several pilots. In addition, the aircraft can be difficult to control at high speeds, leading to numerous incidents of pilot disorientation.

Despite these issues, the Tunnan remains an important aircraft in aviation history. It was the first supersonic aircraft produced by Saab and the first to be designed with a swept-wing design. The Tunnan was also the first aircraft to utilize a turbojet engine and its high thrust-to-weight ratio gave it an advantage in air-to-air combat.

The Tunnan was a revolutionary aircraft in its time and it brought new technologies and innovations to the world of aviation. Its unique design and powerful engine allowed the Tunnan to reach speeds and maneuverability that no other fighter aircraft of the time could match. Its success has made it a popular aircraft among aviation enthusiasts and it remains a testament to the innovative spirit of Saab.