A unique characteristic of the Stridsvagn 103 Main Battle Tank is its two engines, The main engine was originally a six cylinder Detroit Diesel engine, The secondary engine, used for boost power in combat or for cold-weather starting, was a gas turbine Boeing Model 553 that delivered 490 horsepower, The combined output of both engines compares favorably with MBTs with heavier engines that consume more fuel. As part of the total upgrade of all Strv Bs to Strv Cs that began in 1984, a new Rolls Royce K60 diesel replaced the Detroit Diesel engine. The engines are located up front to provide additional protection to the crew of three, who are contained entirely within the hull.
The Swedish-designed 62 caliber 105 millimeter main gun is fed from a magazine holding 50 rounds, With the automatic loader, up to 15 rounds can be fired per minute. The automatic loader ejects spent cases outside the tank. If the automatic loader fails, it can be hand cranked by the radio operator. Two crewmembers can reload the magazine through the rear hatches in ten minutes.
The main gun is aimed by lowering or raising the hull on a special hydraulic suspension system developed in Sweden. Traversing the gun is done by turning the tank. Until the advent of the laser range finder and advanced ballistic computers and fire control systems, this was not a drawback since all tanks had to stop to fire accurately, Today, state-of-the-art MBTs like the Merkava II, the M-1A1 Abrams, the British Challenger, and the Soviet T-64/T-72/T-80 series can fire while on the move, but the tracks of the S tank lock when the main gun is fired.
Two 7.62mm fixed machine guns are mounted on the left side of the hull. A third machine gun is mounted outside the commander's cupola but can be fired automatically from within the hull.
Tank, Bulldozer or Boat?
Each Strv 103C tank carries a bulldozer blade folded back under the nose that can be deployed and operated from inside the tank. Each tank is also fitted with a flotation screen that can be rigged in 20 minutes. This allows the tank to ford streams and rivers at nearly four miles per hour, using its tracks for propulsion.
Some aspects of Strv 103C MBT have been copied by other countries, but to date Sweden is the only nation employing a true turretless MBT. The United States and the Soviet Union are known to be developing turretless models for the next generation of MBTs.
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Learn about the S-Tank's Specifications on the next page.