I just put my new prop on. I got it from RBPROPS.COM (http://www.rbprops.com/) . 11.5x15 river racer it works great it was $450.00!! Its like a whole new boat. I had a Stelling 11 1/4-16 prop on before and could not get it to work / set. Your prop would work great on a big cruser. And is worth some $$$. I have been using 22 gears and have a new set of 29 Im going to put in it soon. I think you will need some more gear. If you go to less pitch.