Outboard engines are detachable engines mounted to the stern of the hull. Inboard engines have various power plans ranging from two-stroke to stock four-cylinder to a stock eight-cylinder engine.In addition to stock engines, Inboard motors can also be highly modified four-cylinder engines. Inboard engines are housed inside the hull as opposed to outboard motors which are on the back of a boat. However, thinner blades, while more efficient, also run the risk of cracking when pushed to the limit by motors with higher horsepower & torque.Mercury Racing has published a series of propeller 101 articles that we highly recommend for those looking to learn a bit more. To help make propellers more efficient, blades should be as thin as possible. More blades reduce vibrations while maintaining efficiency, while propellers with fewer blades are best for lower horsepower engines. Made of stainless steel, the most commonly used propellers are composed of three or four blades. The right propeller is essential to racing your prop can make or break your heat on the water.
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