Many, in fact. The 20-foot class is full of boats, including, but not limited to the Hobie 20, the Inter 20, the Nacra 6.O, the SuperCat 20, and a few others. The Taipan 5.7, while an 18-foot boat, is designed for total crew weights in the 400 lb range, so if your buddies are kinda scrawny, it could work.
<br>In addtion, there are the ARC 21 and 22's. The 21 is 8'6" in beam, while the largely similar 22 is 11' or 12' (I forget; it's real wide.) Sail area is adjusted so that both boats are equally powered up in similar wind.
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<br>good luck<br><br>