Viggen
is a multi-role fighter, in service with the Swedish Air Force in
several versions, since 1971 and they will remain in service until
2006.
In
1952 studies were started to design a replacement for Saab Draken.
In 1954, it was the first to have a canard layout . In 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.
AJ
37 is the strike version 108 of which were delivered.Main armament
for the anti-shipping role is the Saab 304 rocket-powered
anti-ship missile. For ground attack, the armamnet consists of 135
mm Bofors M70 rockets in pods of six each, together with the
command controlled, smokeless liquid fuel Saab 305 missile, and
the 120 kg bombs. It has always had a secondary fighter role, with
Sidewinders and 30 mm cannon in pods.
Sk
37 is the trainer version 17 of which were delivered.
SH
37 is the reconnaisance version 27 of which were delivered. A
forward looking camera is semi-permanently mounted on the right
fuselage station, to register what's been seen on the radar and to
take other photos.
SF
37
is also the reconnaisance version in which fixed cameras are carried in the nose, but it lacks a radar. It has
three cameras for horizon-to-horizon coverage, a wide angle camera
and two cameras for high altitude photography. There is also an
IR-linescanner.
JA
37 Jaktviggen is an air-superiority fighter and also the final
version of the series. 149 JA 37 were delivered between 1979 and
1990.They will be in service until 2004.
It is equipped with a 30
mm Oerlikon KCA with 150 rounds. A unique feature is
the coupling of the radar gunsighting mode to the autopilot,
introduced with Edit 32. When the pilot places a target in a
capture window, the autopilot takes over and presents information
on the HUD for the pilot to follow. The fighter version has an INS
instead of the earlier versions' doppler navigation system.
JA
37 models have also been upgraded. The new radar is now able to
track multiple targets. The latest software upgrade, “Edit
34”, enables the JA 37 to use AMRAAM missiles.