Quote Originally Posted by repomannv View Post
Some really good info in this thread. I knew nothing about boats, let alone props before purchasing my 2021 SA 450... I just looked and I'm running a 16 x 17 prop, which is what my dealer must have spec'ed for me. We only wakesurf, and with a lot of weight on the boat, we have struggled to get the boat to maintain autowake desired speed (say anything above 10.5mph), particularly on heavy current/wind days. I'm thinking now I should swap out my prop to a 16 x 13.9 given our use case.
Even a 16 x 15 will make a big difference. You would be surprised at how little bit of pitch change can go a long way on a boat prop. Just another fyi, which if you don't know anything about props at all, the first number is the overall diameter. The second number (pitch) represents how far the prop will travel through the water in one revolution. For example, your 16x17 is 16" across in size, and will move 17" forward when it make one revolution. NOW. Having said that. The 17" does not really take place because of slippage since water is not a solid object. There are a whole bunch of theory formulas with many variables to figure out what the slippage equates to. But just think about it like putting smaller or larger tires in your truck.

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