Thunder Tiger's .21 Outboard engine features a fresh, innovative design that is sure to increase the popularity of the 3.5cc Tunnel Hull class. A race-proven Pro.21 M-R power head is mated to a lower unit that utilizes the best aspects of gear and flex-cable drive technology. A special set of precision helical gears transfers power from the crankshaft to the flex-cable, resulting in substantially reduced cable wear and maintenance, while the integrated expansion chamber/muffler reduces exhaust noise. The engine mount allows adjustment to both propeller depth and angle, and a Prather S215 prop. is also included.

Thunder Tiger's .21 Outboard engine features a fresh, innovative design that is sure to increase the popularity of the 3.5cc Tunnel Hull class. A race-proven Pro.21 M-R power head is mated to a lower unit that utilizes the best aspects of gear and flex-cable drive technology. A special set of precision helical gears transfers power from the crankshaft to the flex-cable, resulting in substantially reduced cable wear and maintenance, while the integrated expansion chamber/muffler reduces exhaust noise. The engine mount allows adjustment to both propeller depth and angle, and a Prather S215 prop. is also included.