On Tue, 31 Aug 2004 12:42:04 -0400, DSK wrote:

Rodney Myrvaagnes wrote:
Count me as lunatic fringe. I see planing boats every day.

Planing boats have the same limit, in other words as they go faster,
each incremental increase in speed takes an increasing increment in
power. Eventually the power/speed curve gets just as steep as
displacement hulls...


What you describe is not an asymptotic relation.

?

Looks like it to me. It's just much farther to the right on the graph

In neither case does it get vertical, as an asymptote would.

In the case of planing boats, the slope of the curve doesn't even
increase everywhere, buty goes over a hump at the onset of planing.

But ordinary medium-to-light-displacement sailboats zip right past
hull speed when the wind rises.


Rodney Myrvaagnes J36 Gjo/a


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