A propulsion system is exactly that thing which gives a life to the boat and make it go. If the engine is a heart of the jet boat, then the propulsion system is its circulatory system. Usually it consists of the engine, gearbox, shaft, rudder and propeller.

There are many different drive types, but the most usable for small boats are a jet and Sterndrive systems when using inboard engines. The first one being inside the hull uses the water to push the boat streaming it through itself, the second one moves through the water with the help of a propeller placed outside the hull. Both of them has their advantages. Propeller makes a power transfer from the engine to the water very efficient and helps the Sterndrive boats to track smoothly at all speeds. On the other hand, in jet propulsion systems water enters in pump through an …