What is the advantages or disadvantages of a cupped prop? I am currently running a 17 pitch prop on my engine(factory installed) but am thinking of going to a 15 to up my rpm a little....will this give me a little quicker response and get me up to plane faster. I have an Evinrude 55 hp on an 18ft carolina skiff flat bottom. I can't afford to put a bigger engine on there just now so I need some other options. I know this set up will not run down the river 70 miles per hour but I don't like goin fast on water anyway. I inherited this boat from my dad. I fished for many years with him in this set up and always wanted to tweak it a little but he was subborn about "messing" with it.....lol....it takes too long to get up to plane. Any suggestions?