I believe that's a C-Scow. We have a small fleet of them on Clear Lake (NE Indiana) and are one of the fastest inland mono's out there - that I know of at least.
They have lee boards (not keels), that are canted outward so they are vertical when the boat is heeled. Once heeled to about 20°, they have a very long narrow waterline which helps make them fast in light air. When the wind is up, their flat bottom allows them to easily plane.
I had an MC scow (smaller single-handed version) once and loved it. Screaming reaches were almost as fun as my H18. C-Scows have a lot of sail area for their size, so can be a handful in heavy wind, but like any boat, you'd be surprised at what they can do with an experienced skipper/crew.
There's also a larger E-Scow which I'll leave to your Google search. Very powerful and fast. I've seen pictures of people waterskiing behind one!
[edit] - The link goes to many pics which I've just more carefully looked at. I see something that looks like a Flying Scot, some C-Scows, but also some scows with spinnakers (
inland 20's?). Not sure at all about those... although I'd expect them to be even faster than a C in decent wind.
Edited by rehmbo on Jun 03, 2011 - 10:39 AM.
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Jeff R
'88 H18 "Jolly Mon"
'10 C2 USA1193
NE IN / SE MI
cramsailing.com--