Choosing the right prop is key to get- ting the most performance from your boat. The goal is to keep the engine running within it’s recommended rpm range so that it can deliver the most horsepower to the water.
To some extent it’s also important to know what your main use for the boat is. Do you need low end pulling power to pop skiers and wakeboarders out of the water or are you looking for top end speed to get home before the sun sets or to the hot fishing spot to win the derby. I know you wouldn’t be rushing to make last call at the yacht club… ?
Let’s get some basics out of the way. Prop size is typically defined by diam- eter and pitch. You get the diameter
by measuring from the centre of the hub to any blade tip – times 2. Too small and your boat is underpowered, too big and the increased drag slows your boat down (because you ain’t got the horsepower to turn the bigger prop) Pitch is more difficult to calcu- late – it’s the forward movement of the propeller through one revolution.
Typically, smaller boat – smaller prop, bigger boat – bigger prop. Lower pitch gives you more acceleration and pulling power (think low gear) while higher pitch gives more speed. Now before you go out and buy the high- est pitch prop you can, remember that you have to keep to engine rpm within the recommended range at Wide Open Throttle (WOT) or you could see pistons popping like fireworks and an
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