Evinrude E-NATION, for those dedicated to water, power, fishing and fun
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Skipper
Posts: 9
Registered: ‎09-04-2019

how to know what prop is the best?

Hi guys, 

I am curious how to determine what prop size would be ideal for my boat*

I have a 17ft RIB with E-tec 40 and now I have 13.5x15 prop on it, looks huge prop that's for sure, and I bought it like that

cruise speed is around 20mph and max around 28-29mph

anyone knows is this good combo or should I go for smaller prop?

allround performance and low consumption is my goal

 

Thanks

 

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Captain
Posts: 57
Registered: ‎10-14-2016

Re: how to know what prop is the best?

a correct prop should give you about 5600 rpm.

 

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Captain
Posts: 925
Registered: ‎08-20-2017

Re: how to know what prop is the best?

If the boat does not have a tachometer installed a dealer can use the diagnostic program to read rpm profile (history).
If the boat is fairly light the a 15 pitch sounds correct.