The long-tail boat, is a type of watercraft native to Southeast Asia, which uses a common automotive engine as a readily available and maintainable powerplant. A craft designed to carry passengers on a river may include a lightweight long canoe hull, and a canopy.

The gearbox is to providing high torque on the time of starting, then accelerating and pulling a load. When the boat starts, it needs high torque power to get the required accelerating force against the water & other resistances. Hence a device must be provided to convert the high r.p.m out-come of engine to the required amount of r.p.m as well as in the torque we needed. This can be obtained by a set of gears. The gear’s set is enclosed in a gear box. The boat speed is also changed with the help of the gearbox keeping the engine speed same with certain limit.

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