power strokes where the speed is too low. No fuel is used on the mis-fire strokes. Cylinder cooling Otto engines use a flowing water jacket around the cylinder wall, similar to modern engine cooling systems. The stationary Otto engines on display at the Western Minnesota Steam Threshers Reunion all share a single large heat radiator outside the building. This centralized distant heat dissipation system also helps to keep the engine building cool. First use in transportation Otto and his manager Gottlieb Daimler had a major disagreement on the future direction of the Otto engine. While Otto wanted to produce large engines for stationary applications Daimler wanted to produce engines small enough to be used in transportation. After a period of disagreement Daimler left Otto's employ and took Wilhelm Maybach with him. In 1883 Daimler and Maybach created a .5 hp engine that was small and efficient. In order to evade the patents that Otto held on the engine design, a pretense was found concerning a patent issued to Beau De Rochas in 1862, the same year that Otto failed to create his four cycle engine the first time. Those who were jealous of the Otto patents (there were 25 patents) had 1 patent overturned in Germany largely because the court failed to understand the significance of Otto's layered charge system which overcame the problems of explosive combustion which destroyed all engine designs previously. Daimler always referred to his design as an explosion engine, to contrast it against Otto's engine and was able to evade paying royalties to Otto. In 1885 he and Maybach created an engine called the "Grandfather Clock" engine and built a two-wheeled frame around it. This became the first Otto engined vehicle. Daimler's fourteen-year-old son Adolf was the first person to ride on this motorized bicycle which is the first internal combustion engined motor vehicle. The 1885 Daimler/Maybach Petroleum Reitwagen (Riding Car) was the first motorcycle (and the first motor vehicle) using an internal combustion engine. While Deutz continued to produce large stationary engines Daimler moved onto boats, airships, locomotives, automobiles, trucks, and other transportation uses. Deutz is the world's oldest engine producer. Daimler, which became Daimler-Benz, is the world's oldest automobile manufacturer. Daimler-Benz produced this video for the 125th anniversary of the creation of the first motor vehicle which Daimler called the "Petroleum Reitwagen." It used a hot tube ignition specifically because the electrical systems of