The ST 996 9-cylinder 96 cc (5.9 cubic inches) is the largest of the three in this series of engines. It was designed in 1993 by Wolfgang Seidel. It has a speed range of 1,000 to 5,000 revolutions per minute using a 26-10 propeller. It burns methanol with castor oil mixed in for lubrication, and it is capable of producing 5.4 horsepower. The engine is 9”-long, 11”-wide, and 13”-high.