Starting point on prop selection

[Jamie Thompson]

I have a 18 foot spirit bass boat . I am looking for a starting point on a prop . It has a 1986 150 black max on it with a jack plate . Not fur sure on the max rpm this motor is rated for . Tks for all the help !!

 

[Sea Rider]

Welcome to Iboats.

The starting point for any engine will be the current prop that came with the engine. Will need to know diam and pitch and engine wot rpm range. Will need to go you alone on a wot spin with lightly loaded boat on calm flat no wind watwer cond to check achieved max wot rpm and then select other prop to suit best your boating needs, that's if in need.

Happy Boating

 

[Texasmark]

go-fast.com prop selector. Plug in the numbers and get the results. There will be some variances in actuals and predictions based upon your particular rig but this will give you an idea.