1953 Twin 40mm Self-propelled Gun M42 Duster USA
A total of 3,700 M42s were built. The vehicle has a crew of six and weighs 22,500 kg (49,500 lb) fully loaded. Maximum speed is 45 mph with a range of 100 miles. Armament consists of fully automatic twin 40 mm M2A1 Bofors, with a rate of fire of 2x120 rounds per minute (rpm) and either a .30 caliber Browning M1919A4 or 7.62mm M60 machine gun. The 500 hp, six-cylinder, Continental (or Lycoming Engines), air-cooled, gasoline engine is located in the rear of the vehicle. It was driven by a cross-drive, 2-speed Allison transmission.
Although the M42 Duster was initially designed for an anti-aircraft role, it proved highly successful when used in the Vietnam War against unarmored ground forces.
Weight - 24.8 t (loaded)
Length - 5.82 m (19 ft 1 in)
Width - 3.23 m (10 ft 7 in)
Height - 2.85 m (9 ft 4 in)
Crew - 4–6
Armor - 9–25 mm
Main armament - M2A1 40 mm twin anti-aircraft gun with 336 rounds
Secondary armament -1 × M1919A4 7.62 mm machine gun
Engine - 6-cylinder air-cooled gasoline 500 hp (375 kW)
Power/weight - 22.2 hp/t
Suspension - torsion bar
Operational range -160 km (99 mi)
Speed - 72 km/h (45 mph)