There will always be a number of propeller size combinations that will work on your vessel, finding the best one is the trick. these calculators will help guide you to determine various combinations of power, gear ratio, and propeller for your vessel.. Use a calculator, if there are several passengers, to multiply the top horsepower rating by 1.10. if the plate says a 120 horsepower engine is the largest you should use, then: 120 x 1.1 = 132, or a 130 horse motor, since the horsepower of outboard motors is rated in multiples of 10.. It is assumed- or explicitly stated in the rules- that the boat must be structurally capable of handling its rated power. your transom is designed to handle the largest, heaviest outboard that the boat's rating allows; that rating is determined by the boat's size and shape..
The stock propeller is an 11.25 inch diameter and 9.75 inch pitch. first, speed of propeller advance is different to boat speed through the water. due to the fact that friction of the boat and its appendages with the water drags water along and the propeller moves slower than the boat through the water.. Re: guide to calculate the right motor for a sailboat originally posted by mmd displacement is certainly one of the primary factors in determining required horsepower, and derivation of power requirements by evaluating similar vessels is a tried-and-true method.. Transom width: is to be measured at the widest point of the transom including permanently attached parts of the boat such as rub rails. click on the image for the full size. boat length: length does not necessarily include such things as swim platforms..
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