SAAB JA 37 Viggen (Wallpaper 4)
Sunday, May 15, 2011
image dimensions : 1092 x 682
SAAB JA 37 Viggen (Wallpaper 4)
SAAB JA 37 Viggen fighter aircraft photo wallpaper gallery 4. SAAB JA 37 Viggen fighter airplane pictures and images collection 4.
The Viggen was powered by a single Volvo RM8 turbofan. This was essentially a licence-built variant of the Pratt & Whitney JT8D engine that powered commercial airliners of the 1960s, with an afterburner added for the Viggen. The airframe also incorporated a thrust-reverser to use during landings and land manoeuvres, which, combined with the aircraft having flight capabilities approaching a limited STOL-like performance, enabled operations from 500 m airstrips with minimal support. The thrust reverser could be pre-selected in the air to engage when the nose-wheel strut was compressed after touchdown. The Viggen was the first aircraft to feature both afterburners and thrust-reversers. Only the Viggen, Concorde and the Panavia Tornado featured both afterburners and thrust-reversers. During the 1980s, Viggen pilots gained the distinction of being able to achieve missile lock on American SR-71 Blackbird reconnaissance aircraft. This was accomplished by analyzing the Mach 3+ planes' predictable flight paths over the Baltic Sea. With the arrival of the new Saab JAS 39 Gripen in the late 1990s, the Viggen began to be phased out of Swedish service. SAAB JA 37 Viggen (Wallpaper 4). SAAB JA 37 Viggen fighter aircraft photo wallpaper gallery 4. SAAB JA 37 Viggen fighter airplane pictures and images collection 4. The type was retired from frontline service in November 2005 with the last flight of any type occurring two years later. Though a highly regarded aircraft, the Viggen was not purchased by any additional countries despite being offered for export. This lack of sales was largely the result of Sweden's strict limits on arms exports to undemocratic regimes, international pressure against particular sales, as well as international pressure. 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 favoured, since the latter were mainly limited by metallurgy development resulting from limitations in turbine temperature. Mechanical simplicity was also favoured, 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 disadvantage was that the required engine would be very large. In fact, at the time of introduction, it was the second largest fighter engine, with a length of 6.1 m and 1.35 m diameter; only the Tumansky R-15 was bigger. SAAB JA 37 Viggen (Wallpaper 4). SAAB JA 37 Viggen fighter aircraft photo wallpaper gallery 4. SAAB JA 37 Viggen fighter airplane pictures and images collection 4.
SAAB JA 37 Viggen fighter aircraft photo wallpaper gallery 4. SAAB JA 37 Viggen fighter airplane pictures and images collection 4.
The Viggen was powered by a single Volvo RM8 turbofan. This was essentially a licence-built variant of the Pratt & Whitney JT8D engine that powered commercial airliners of the 1960s, with an afterburner added for the Viggen. The airframe also incorporated a thrust-reverser to use during landings and land manoeuvres, which, combined with the aircraft having flight capabilities approaching a limited STOL-like performance, enabled operations from 500 m airstrips with minimal support. The thrust reverser could be pre-selected in the air to engage when the nose-wheel strut was compressed after touchdown. The Viggen was the first aircraft to feature both afterburners and thrust-reversers. Only the Viggen, Concorde and the Panavia Tornado featured both afterburners and thrust-reversers. During the 1980s, Viggen pilots gained the distinction of being able to achieve missile lock on American SR-71 Blackbird reconnaissance aircraft. This was accomplished by analyzing the Mach 3+ planes' predictable flight paths over the Baltic Sea. With the arrival of the new Saab JAS 39 Gripen in the late 1990s, the Viggen began to be phased out of Swedish service. SAAB JA 37 Viggen (Wallpaper 4). SAAB JA 37 Viggen fighter aircraft photo wallpaper gallery 4. SAAB JA 37 Viggen fighter airplane pictures and images collection 4. The type was retired from frontline service in November 2005 with the last flight of any type occurring two years later. Though a highly regarded aircraft, the Viggen was not purchased by any additional countries despite being offered for export. This lack of sales was largely the result of Sweden's strict limits on arms exports to undemocratic regimes, international pressure against particular sales, as well as international pressure. 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 favoured, since the latter were mainly limited by metallurgy development resulting from limitations in turbine temperature. Mechanical simplicity was also favoured, 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 disadvantage was that the required engine would be very large. In fact, at the time of introduction, it was the second largest fighter engine, with a length of 6.1 m and 1.35 m diameter; only the Tumansky R-15 was bigger. SAAB JA 37 Viggen (Wallpaper 4). SAAB JA 37 Viggen fighter aircraft photo wallpaper gallery 4. SAAB JA 37 Viggen fighter airplane pictures and images collection 4.
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