I clocked 37.8 knots today in maybe 15 knots of wind (gusts) while sailing DN, first time on board (I even capsized once <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />). More experienced DN sailor hit 42.5 knots to my GPS in short run.

On water 20 knots feels lot more than on top of ice, at least I didn't feel the speed unless I was watching shore, over 30 knots was scary at first though <img src="http://www.catsailor.com/forums/images/graemlins/wink.gif" alt="" />.