I just bought an older sundancer with a 5.7l 260 hp merc. The prop that's on the the boat now has a number 51040. I can't find the size of the prop online. Does anyone know how I can find out the size and pitch? I haven't had it out yet other than a short test ride, so I don't know what WOT is right now. I had the same boat years ago, and this is sluggish compared to that one, but the first one had twin 175s so I can't really compare. Any help greatly appreciated.