Re: Prop selection for a 20sf w/ 130 Yamaha --Help--
Are you currently running an aluminum prop? Best to get it dialed in first (so it turns max allowable rpm at max load) with the aluminum prop, since aluminum props can be repitched easily to adjust max rpm. Once you know that, it's pretty easy to find the equivalent SS prop, which will have slightly more diameter, pitch, or cup.
That's a pretty light motor, so you may not need a stern lifting prop, but I've found that the 4 blade props give great low end acceleration and mid-range mpg, although they may cost a few mph on top end. They'll also help you plane at 10-12 mph in rough conditions which is big deal if you run in rough conditions.
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