Just changed over the prop on my 98' johnson 200 from a 15-1/2 x 15 aluminum to a 14-1/2 x 17 4 blade stainless renegade. boat is a 26' seaswirl w/a. felt way to slow with the aluminum on it.took a while to plane. now with this new prop its unbelievable. never thought a prop would make such a difference in the handling but its like a whole new boat with it. i also gained 8mph at wot (5300 rpms). just thought i would share this