2013 Mercury 40 Bigfoot efi

by Boo
(Palacios, TX)

I just recently bought an 18ft Sun Tracker Bass Buggy with a 2013 Mercury 40hp Bigfoot efi, which has a 14 x 9 aluminum prop. WOT recommended rpm is 5500 to 6000. With this prop, it runs at 5500. I will be using it in shallow coastal bays with possible oyster beds, etc. and want a stainless prop for it. The only thing close that I could find is a 14 x 11 stainless which I tried, but it was running at 4800 wot. Is there any kind of conversion chart to show similar prop loads, rpm, etc, or some way to figure out a smaller/ different prop/ pitch combo to not strain the motor?

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