Pete's Prop Shop, Belleville, ON

The two most important things to remember in choosing a propeller are that it meet your individual needs for your
individual application and that it allow the engine(s) to run within the specified RPM range at full throttle. Each boater and fisherman is trying to meet his requirements, but they can vary a lot.
What’s important to you? Top Speed, Cruising Speed, Hole Shot, Load Carrying, Slow-Speed Handling, Slow Trolling, Fast Trolling?
Two identical boats with identical engines could be propped quite differently, depending on the usage. There is no such thing as the best or ideal prop for all applications. Acceleration may be compromised for top speed and fuel economy, and visa versa.

Three Blades or Four?
In general, 3- blade props are the most common.They are available in wide size ranges and cost less than 4-blades. They tend to yield a slightly higher top end speed than 4-blades. They are available in a wider variety of designs and offer more left hand rotation pitch options for twin counter-rotating engine applications.
Four-blades often provide more lift at the stern which will help accelerate the hull, especially if it is stern heavy.
They provide faster hole shot pulling skiers and other water sports. When cruising boats, they are often times slightly faster than 3-blades at mid-range rpm’s, resulting in better fueleconomy at mid-range rpm.
Often times, a four blade propeller will improve handling and will run smoother with better balance than the 3-blade.