Connect with us

Hi, what are you looking for?


Meet the S37 Viggen: The Combat Plane Built to Fight a Russia War

S37 Viggen
S37 Viggen. Image Credit: Creative Commons.

While fighter jets like the F-35 and F-22 come to mind – and especially U.S. fighter aircraft overall – Sweden makes some very impressive warplanes. The S37 Viggen was clearly one of them: Throughout the Cold War, the Scandinavian nation of Sweden maintained a strict policy of neutrality yet still prepared for a possible war with the Soviet Union.

To help facilitate the policy, Stockholm also adhered to a strict policy of indigenous design, development, and production of its frontline military equipment – notably aircraft. At the end of the 1960s, Sweden began to develop a new multirole fighter that was designed from the outset to be “battlefield friendly.” In this case, the aircraft needed to be able to take off from short runways and in a pinch use Sweden’s large networks of highways and remote roads. Moreover, the new fighter needed to be easy to refuel and rearm by conscript-level troops.

Enter the S37 Viggen

The result was the Saab S37 Viggen or “Thunderbolt,” a single-seat, single-engine fighter that featured a low double delta wing with two canards equipped with flaps. Designed to replace the aging Saab J35 Draken, the Viggen’s first flight took place in 1967 and it entered service with the Swedish Air Force in 1971. It was also the first canard-designed aircraft to be mass-produced, and at its introduction, it was the most advanced fighter jet in Europe and remained so until the Panavia Tornado entered service in 1981.

Several distinct variants of the Viggen were produced and these include the AJ37, which was designed to fulfill a strike fighter role; the aerial reconnaissance SF37; the SH37 maritime patrol version; a two-seat trainer SK37 version; and the JA37 all-weather fighter-interceptor. From 1970 to 1990 some 329 of the Viggens were produced, and Sweden was the only operator. In November 2006, the platform was retired.

S37 Viggen: A Number of Notable Firsts

The Viggen was powered by a Volvo RM 8 turbofan, which was, in essence, a license-built version of the Pratt & Whitney JT8D engine that was used to power commercial airliners in the 1960s. An afterburner was added to the S37, while the airframe also featured a thrust-reverser, which could be used during landings. It was the first aircraft to feature both an afterburner and thrust-reverser – a feature later seen in the Tornado and the Concorde commercial airliner. With its limited short take-off and landing (STOL) abilities, the Viggen could operate from airstrips that were around 500 meters.

The aircraft had a maximum speed of Mach 2.1 (1,385 miles per hour), a maximum range of 2,000 km with internal fuel, and a service ceiling of 18,000 meters. The RM 8 engine provided a rate of climb of 203 meters per second.

Designed as a single-seat aircraft, the Viggen featured advanced avionics, which included a central computer and heads-up display to replace a human navigator. This included the CK 37 (centralkalylator 37), the world’s first airborne computer to utilize integrated circuits.

The fighter was a true warbird, and was armed with a 30mm Oerlikon KCA cannon, and was also fitted with six underwing/under-fuselage hardpoints, which could be used to carry air-to-air and air-to-surface ordnance. Typical weapons loaded include AIM-9 Sidewinders, AIM-120 AMRAAM and RB71 Skyflash missiles.

While Stockholm originally planned to produce 800 of the Viggen, the order was cut short due to costs and the fact that the aircraft wasn’t offered for export, despite it being proposed as a replacement for NATO’s F-104 Starfighter. Saab had initially marketed the aircraft around the world, but Swedish export laws were an issue – while the United States also blocked a potential sale to India by not granting an export license for the engine, as it used American technology, thus giving Washington a say.

While the Viggen was never used in combat, this aircraft would have been like a thunderbolt from the heavens had any pilot of the Viggen taken to the skies in anger.

Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers, and websites. He regularly writes about military small arms and is the author of several books on military headgear including A Gallery of Military Headdress, which is available on

Written By

Peter Suciu is a Michigan-based writer who has contributed to more than four dozen magazines, newspapers and websites. He is the author of several books on military headgear including A Gallery of Military Headdress, which is available on Suciu is also a contributing writer for Forbes Magazine.



  1. gene otterness

    April 22, 2022 at 2:14 pm

    One time a Russian pilot was talking to a E.U. pilot about the aircraft their country makes. E.U. pilot; we build one of the most sophisticated planes in the sky. To where the Russian replied . You build a plane like a fine Swiss watch !
    We build it like a Mikey Mouse watch. “You drop a fine watch it stops, broken. Drop the Mickey Mouse watch” It stop! You shake it! And its back to working again.
    Russian aircraft of old could land on primitive runways. Deflector flaps on engine intakes to eliminate debris kicked up off runways.
    Ammo on many guns were same as used on its armor fighting vehicles so could upload ammo from vehicle in the field if need be.
    Some thought like this is needed for front line combat aircraft.
    The A10 WhartHog was one such aircraft.

    A 30-30 Wincherster of the air.

  2. Superkuf

    April 24, 2022 at 9:00 am

    The designers of swedish military materiel had a great advantage: they knew it would be used by swedes, in Sweden, against the Soviet Union (and later Russia). All materiel is designed for Swedish conditions – low population density, a lot of forest (and short sight lines), a conscript army/home guard and so on. Against a big but inflexible enemy with limited air/sealift capacity. Viggen is just one example of this.

    But the two big advantages of Viggen isn’t mentioned in the article. Firstly, a very demanding training scheme that promoted invididual action and realistic (= very dangerous) exercises. It was standard for the attack pilots to fly 10 meters above the surface of the Baltic sea. At night. With simulated war load.

    Secondly Viggen got by the early 80s a data link system that then was more advanced than NATO Link 16 is today. The swedish warplanes of today had to downgrade their abilities to get NATO interoperability.

Leave a Reply

Your email address will not be published.