SAAB 37 Viggen Attack Fighter - Thinking Outside The Box

The requirements from the Swedish Air Force dictated Mach 2 capability at high altitude and Mach 1 at low altitude. At the same time, short-field takeoff and landing performance was also required. Since the Viggen was developed initially as an attack aircraft instead of an interceptor (the Saab 35 Draken fulfilled this role), some emphasis was given to low fuel consumption at high subsonic speeds at low level for good range. With turbofan engines just emerging and indicating better fuel economy for cruise than turbojet engines, the former was favored. Mechanical simplicity was also favored so the air intakes were simple D-section types with boundary layer splitter plates, while the fixed inlet had no adjustable geometry for improved pressure recovery.
The JT8D "Iroquois" engine was chosen as the basis for a Volvo Aero modification instead. The RM 8 became the second operational afterburning turbofan in the world, and also the first equipped with a thrust reverser. It had a bypass ratio of around 1.07:1 in the RM8A, which reduced to 0.97:1 in the RM8B. The AJ, SF, SH and SK 37 models of the Viggen had the first version of the RM 8A engine with up-rated internal components from the JT8D that it was based on. Thrust was 65.6 kN dry and 115.6 kN with afterburner. For the JA 37, the RM 8A was modified to an 8B by replacing one LP compressor stage with a fan stage and improved combustor, turbine and afterburner. Thrust is 72.1 kN dry and 125.0 kN with afterburner.
The purpose of the canard wings were to act as vortex generators for the main wing and therefore provide more lift. An added benefit was that they also improved roll stability in the transonic region around Mach 0.9. The canard flaps were deployed in conjunction with the landing gear to provide even more lift for takeoff and landing.

Category:

Science & Technology

Tags:

• military
• aircraft
• extreme
• action
• defense
• technology

[sisuxa]

Thanks for a grait video, Viggen is a fantastic aeroplane with a lot of power,

Designed specially for the Swedis Airforce.

I did my serve at "2 Stn Kompanit F6"