I have a Yanmar 2GM which is listed at 13hp, with a three blade 13x13 prop. I have good power in open ocean into the wind. I often go through the Blynman Cut on the Annisquam River, and while I try not to go through at high or low water, it will do it if need be. Greg Bover Frances Fitch Linnet #114 Gloucester 1331815174.0