Jonathan Ganz wrote:

Ummm... isn't the hull speed 1.34x(sq.root of waterline)? So that
would be about 7 kts. Are you surfing or own a multi?

yes grasshopper, your math is correct and no I'm not surfing and no it's
not a multi

How did you arrive at the 8-10 kts?

well first we put up the main... sorry, couldn't resist
knotmeter, verified against gps, flat water on the windward shore, winds
25 gusting 35

There is some kind of voodoo involved in the design of this hull. The
older versions (like mine) of this hull design have a spoon entry, keel
longer than it is deep, with flattish, almost scow-like aft sections.
It's just friggin spooky how fast this thing can be. I can keep pace
with just about any cruising sailboat up to about 38'. Two years ago I
kept pace with a boat over a 22nm stretch going flat out downwind with
only the main wung out. He beat us into Killarney by about 1000m. It
was a 65' Hallberg-Rassy registered in Basel, Switzerland that was doing
the swee****er seas on its way around the world. The skipper of that
beautiful boat came over to see just what it was that he couldn't shake!

See fer yerself

http://www.clic.net/~dcooper/hinterh.../specside.html

the one pictured is the "newer" hull shape with a more upright entry and
a fuller aft section above the waterline. The shape below or the
profiles at the different stations are similar enough to be unchanged
from the earlier marques.