Viggen is a multi-role fighter, through upgrades still modern and with some almost unique features, in service with the Swedish air force in several versions, since 1971 and until after 2006. The name Viggen means The Thunderbolt, especially those resulting from the Norse god Thor's warhammer Mjölner.
In 1952 studies were started to design a replacement for Saab Draken. "Project 1357" in 1954, was the first to have a canard layout (lots of other layouts were studied as well). I n 1961, P&W JT8D-22 was the chosen engine to be locally built, with a locally designed afterburner and lots of material changes in the rest. In 1962 the design was frozen, and the prototype first flew in Feb 8:th 1967. During the 1960's, it was foreseen that the Swedish air force would purchase 800+ Viggens, but the final figure ended up at 329.
In order to make the airframe smaller, it was early decided to replace the navigator with a good navigational computer. It's designed to withstand 12 G, but the limit in operation is 7 G.
The seat in angled back 19 degrees.
Emergency power is supplied by a ram air turbine just before the left wing leading edge, which extends automatically on hydraulic power failure, and just before touch down. (Earlier, it was also always deployed whenever the landing gear was down.)
The canard doesn't contribute much lift in itself during normal flight, it acts more as a gigantic vortex generator for the main wing. During low speed flight, its rear edge flap can be lowered to increase lift and permit a high nose angle.
The requirement was that the aircraft would be able to operate from 500 m runways. A short take-off run is possible due to the powerful engine (then, it was the most powerful installed in a fighter).Viggen is a multi-role fighter, through upgrades still modern and with some almost unique features, in service with the Swedish air force in...all »Viggen is a multi-role fighter, through upgrades still modern and with some almost unique features, in service with the Swedish air force in several versions, since 1971 and until after 2006. The name Viggen means The Thunderbolt, especially those resulting from the Norse god Thor's warhammer Mjölner.
In 1952 studies were started to design a replacement for Saab Draken. "Project 1357" in 1954, was the first to have a canard layout (lots of other layouts were studied as well). I n 1961, P&W JT8D-22 was the chosen engine to be locally built, with a locally designed afterburner and lots of material changes in the rest. In 1962 the design was frozen, and the prototype first flew in Feb 8:th 1967. During the 1960's, it was foreseen that the Swedish air force would purchase 800+ Viggens, but the final figure ended up at 329.
In order to make the airframe smaller, it was early decided to replace the navigator with a good navigational computer. It's designed to withstand 12 G, but the limit in operation is 7 G.
The seat in angled back 19 degrees.
Emergency power is supplied by a ram air turbine just before the left wing leading edge, which extends automatically on hydraulic power failure, and just before touch down. (Earlier, it was also always deployed whenever the landing gear was down.)
The canard doesn't contribute much lift in itself during normal flight, it acts more as a gigantic vortex generator for the main wing. During low speed flight, its rear edge flap can be lowered to increase lift and permit a high nose angle.
The requirement was that the aircraft would be able to operate from 500 m runways. A short take-off run is possible due to the powerful engine (then, it was the most powerful installed in a fighter).«
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