Had a Yamaha 13 x 19 on my F115. Was getting a little dinged up so bought the Hustler 13.5 x 19.
On the old prop wot was right at 6000 and 39 mph, gps.
I was surprised that with the new prop wot was 5600 rpm and 41.5 mph.
You experts think I should go with a 17 pitch? That's the next one down...