Hull speed
The Mac is a boat that is trying to be two boats in one. Usually, it has been my experience that things that are designed for more than one task do both poorly. I sailed both the Mac 26 and a Hunter 26.5 (86) and from a sailing point of view there is no comparison, although, the Mac does have the feature of "high speed" powering. Now to hull speed, a boat designed as a sail boat gennerally has a displacement hull which is subject to speed limitations. With out going into great detail, it is related to lenght of the boat at the water line. Therefore the longer the water line the faster the boat is capable of going, regardless of the power applied to the hull. So I would be careful with the idea that just sticking a larger engine on a sail boat will make it blast around like a power boat, not so. Kevin