The second vehicle, the Ausf F, was as different from the Ausf C as it was from the Ausf A and B. Intended as an infantry support tank, the Panzer I Ausf F had a maximum armour thickness of 80 millimeters (3.15 in) and weighed between 18 and 21 tonnes. The Ausf F was armed with two 7.92-millimeter MG-34s. Thirty were produced in 1940, and a second order of 100 was later canceled. In order to compensate for the increased weight, a new 150 horsepower (110 kW) Maybach HL45 Otto engine was used, allowing a maximum road speed of 25 kilometers per hour (15.5 mph). Eight of the thirty tanks produced were sent to the 1 Panzer Division in 1943 and saw combat at the Battle of Kursk. The rest were given to several army schools for training and evaluation purposes.