[MHml] 24h record by small boat?
multihulls at steamradio.com
Sat Mar 17 18:26:50 EST 2001
Dave Culp wrote:
> ...These boats are experimenting
> with angled daggerboard lift today; they will soon "back in" to
> becoming fully foilborne, IMO. At that time, boat length becomes of
> little interest...
I don't think so. If you're talking about subcavitating foils,
the big cats are already sailing at the end point of what can be
achieved with foils. Look at Longshot - Ketterman has never been
able to push her past the 40 kt mark because of cavitation.
Supercavitating foils would not be so limited, but I have my
doubts as to whether they would be efficient enough for a sailing
craft. I haven't tried to run any numbers, though, so this is
I see hydrofoils as being of more value to turn a small boat into
a giant-killer in the right conditions. A small boat that takes
off at 12 kt and goes 30 kt gains a lot more than a big boat that
takes off at 20 kt and goes 30 kt (150% vs 50%). But the big boat
is still going to be faster in light winds (less wetted
area/displacement, taller rig) and in heavy conditions when the
foiler can't fly.
At any rate, you're not going to create a supercavitating flying
foiler by evolving from angled dagger boards. It's going to have
to be completely engineered as a whole system.
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