![]() ![]() Remember that in any application, discrepancies in performance can result due to the different boat hull designs, the final carrying load and your particular needs. The propeller selection chart can be used to help you in selecting the correct propeller for your Tohatsu outboard. UNDER NO CIRCUMSTANCES SHOULD YOU EVER USE A PROP WHICH WILL ALLOW YOUR OUTBOARD TO OPERATE ABOVE THE OUTBOARD'S RECOMMENDED MAXIMUM RPMs! If the hole-shot speed is important to you, for example if you pull water skiers most of the time, then you would want to go with a lower pitch prop and sacrifice some of your top-end speed but increase your hole-shot speed to get the skiers up faster. On the other hand, decreasing the pitch will increase your hole-shot but sacrifice some of your top-end speed. In general, changing to a higher pitch prop will increase your top-end speed but reduce your acceleration (reduce your "hole-shot" power). This variance is referred to as slippage. In reality, no 14-inch pitch blade will advance a boat 14 inches with one full turn. But, in general, when standing at the back of the boat looking forward, with a single STD Rotation (LH/CCW) engine, most of the transmissions turned CW. A few of the older, Iron-Body transmissions with specific ratios would turn either direction. Theoretically, a propeller with a 14-inch pitch, when rotated one full turn, would advance a boat 14 inches through the water. In most cases the propeller rotation will differ from the engine rotation due to the gearing. Therefore, a 12" x 9" propeller would have a 12-inch diameter and a 9-inch blade pitch. ![]() The diameter is referenced first and the pitch is second. When describing a propeller both the diameter and pitch are given. Pitch is the distance that a boat will travel if rotated one revolution without any slippage. Diameter is the distance measured across the propeller hub line from the outer edge of the circle that is made by the propeller's blades during rotation. I purchased them from different people and now. Propellers have two basic dimensions diameter and pitch. Different Prop I recently bought a used Mercury, Mark 58 A, 45 hp outboard motor and a used 16' runabout. ![]()
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