I bought this boat this spring, my first sterndrive. It came with a second prop. Last weekend the prop on it slipped (spun). I replaced it with the second prop and now it goes much slower, has less power and takes forever to plane out. Looking to purchase a replacement prop but not sure where to start. No documentation with this old boat. No idea what prop is on it now. We have been pulling a tube and cruising with it, but will be doing some salmon fishing this fall on Green Bay. We will need to go about 45 miles from the slip (by Sturgeon Bay) to get to the fishing area by Washington Island so speed/fuel efficiency is a consideration as well. Any suggestions for diameter/pitch I should be looking for? I would like the speed back. I was getting ~32mph according to my GPS. In the low to mid 20's now. I will look at the old prop tonight and see if it has any writing on it. The boat is docked an hour away so I can't just run over and look at the new prop. Any help for this newbie would be appreciated.