Ive got a 87' 20SF with a yamaha F115. Currently im running a 17p stainless yamaha prop. My WOT is 33mph at 5600rpm. Ive got a 4s so im propping closer to 6000rpm but i talked to ken at prop gods and he recommended the powertech RED3 (13 1/4X15p)
Heres the thread i started:
http://www.propgods.com/forum/defaul...g=posts&t=1707