Increasing the pitch increment by 2" will result in approximately a 300-400 RPM drop. If your test results in your being able to over-rev the engine, you need to increase the pitch of the propeller. If during this test, you begin to exceed the maximum rated RPM of the engine, reduce throttle setting to a position where maximum RPM is not exceeded. Using your existing propeller, determine what is the maximum RPM you are able to obtain. The correct propeller will prevent the engine from over-revving, yet allow it reach the minimum RPM where maximum horsepower is produced. The goal in propeller selection is to determine what propeller style and size will maximize performance for your boat, while allowing your engine to operate in the recommended RPM range. This will be expressed in terms of a certain horsepower at a certain RPM. This can be located in your operator's manual. Selecting the right propeller for your boat and engine combination: The proper propeller size for your boat and engine combination is based on the wide open throttle operating range for your particular engine. If you have any questions, or if you would like a consultation regarding your boat propeller needs, call us toll free at (877) 238-8214 and our staff will be more than happy to assist in finding the right boat propeller for you. That convenience combined with our free UPS ground shipping (orders of $200 or more) and our low price guarantee make us the right choice when it comes to boat propellers and accessories. Most of our items are in stock and ship within one business day. Contact us today and we will gladly do the same for you. Boaters around the world trust The Delta Propeller Company for their boating and propeller needs. Our premium line of boat props includes Acme Propellers, Ambush4, Apollo, Ballistic!, Mercury, Michigan Wheel, OJ Props, Power Tech!, Solas, Turbo, Volvo, and Vortex. With nearly 40 years of service and sales experience, our staff will help you select the right boat prop with the right dimensions, pitch and engineering and do it at a price that allows for both top quality and value. The Delta Propeller Company proudly offers boat props for almost any type of engine and vessel including: sailboats, ski boats, outboard boat props and stern drive propellers. Expert Boat Propellers Performance Advice With a full line of new and used boat propellers, boat propeller hardware, boat propeller shafts and boat trailer accessories we are well equipped to assist you with your boat prop needs for both lake and ocean faring vessels. As proud members of the National Marine Propeller Association, our goal is to provide our customers with the finest in boat propellers and boat propeller repair. From the land of the Great Miami River in Cleves, Ohio, The Delta Propeller Company has been supplying and servicing boat propellers since 1972.
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