The 9.9 Yamaha does "just fine" in the rough seas... You look at "the big boats" , take my previous boat, a Catalina 30 (1988). Weights 12,800, with winged keel and bowsprit... It had a 15 hp Univeral in it.... Now take the 3,000 lb. Macgregor and anything above a trolling motor would be applicable.
The MacGregor offers me "moveability"... I plan to be in Door County soon, the "UP" (Houghton/ Hancock), and LOWISA (Lake of the Woods regetta) this summer... Only possible because I can trailer my MAC26X... Look for me "UnderSail" (in 24" letters on the side) with a wimpy motor and a smile on my face......