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Panzerwerfer 42 auf Maultier, Sd.Kfz. 4/1, which first went into production in April of 1943, and was produced until March of 1945. Hitler called for production of the vehicle in January of 1942, and the vehicle saw its first tests on the front in Autumn of 1943. The rocket launcher was on a chassis referred to as "Maultier", which translates as "Mule". The vehicle is referred to with the suffix "42", but all of the German texts about the vehicle refer to it as the Panzerwerfer 43, a reference to its first year of production. Opel was the main manufacturer, producing most of the components, including the 3.6 litre, 6 cylinder Adam Opel engine, which had 68 horsepower and an 80 litre fuel capacity, Throughout the three years it was produced, 300 Panzerwerfers and 289 variants of it, the Munitionkraftswagen, were made. The Munitionkraftswagen, or Sd.Kfz. 4, was exactly the same vehicle, without the rocket launcher and was mainly used for ammo resupply. The Panzerwerfer had a 150mm 10 x barrel rocket launcher, which traversed 270 degrees, could be elevated up to 80 degrees. Targetting was with the RA35 optical sight. It had a crew of three, a commander, who was also the driver, a radio operator and a gunner.