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What to Consider When Buying a Boat Propeller

Typically, boating enthusiasts forget to consider the importance of their boat’s propeller. The propeller is the direct connection between the horsepower and the water. Hence, before purchasing a propeller for your boat, be sure all the crucial considerations are made.

Finding the Right Shape and Size

Propellers are available in various shapes and sizes. When it comes to sizes, measurements are taken in terms of diameter and pitch. First and foremost, be sure that the pitch is consistent with the manufacturer’s recommended WOT (wide open throttle) range. Hence, the throttle should be able to fully advance as you turn the minimum rpm that the engine was made for. As the pitch of a propeller goes up, there is an accompanying in crease in weight or limit for the engine to raise its rpm’s. A 50-horsepower engine may only be capable of turning a 15-pitch propeller, while a 750 horsepower offshore race engine can turn over 30 inches of pitch.

Looking into Diameter

Diameter is another measurement that impacts rpm capabilities as well as other boat and hull personalities. A good number of the diameter choices are predetermined by the manufacturer for the user. This can work great in most low-high performance applications. However, fine tuning diameter can improve general performance in drastic ways. Less diameter usually means higher rpm and vice-versa. Changes in diameter will adjust the running attitude of the hulls as well. Not that diameter adjustments are always necessary though, considering buyers can match stock diameters to propeller types.

Blade Count

Theoretically speaking, the lower the number of blades, the faster the speed is. This is based on the fact that more blades cause more metal in the water, thus more drag. However, if you have an inefficiently running boat, more blades can give the boat more capability to “hook up” and improve its performance thoughout the torque band. The specific application the boat is being used in will help the operator to determine the number of blades needed to gain the best results.

Selecting the right propeller for your boat propeller does get intimidating sometimes. Talking to a specialist is the most effective way of maximizing your benefits from your boat set-up, propeller included. Most are happy to help by sharing their expertise. You may not even have to come and meet them personally. Just participate in online forums and get tips from there.

Finally, the most vital starting point is knowing your engine or engines capabilities. When you’ve got this out of the way, you can be sure that the engine package is protected from propping-related improve rpm. From hereon, you can make a decision as to whether you want to upgrade to the next level of performance.

What Research About Boats Can Teach You

Practical and Helpful Tips: Boats