thanks for the comments.

for planing purposes angle of heel isn't important. there isn't any. since
the boat can be assumed to be on a beam reach the full horsepower of the sail
can be used in the calculation.

I've planed Albacores. The planing wind speed I got using the numbers
available does seem high, but then I never had a wind speed (apparent)
indicator in the boat.

When someone designs a planing boat, and there are light displacement
planing cruisers although much larger displacment that this tiny one I'm
playing around with, he or she has to use a formula for predicting sail
area for the boat to plane. That's what I'm looking for.

I'm having a good time working out all the numbers with the Plue Peter and
Carlson hull programs (and my own skiff program) and comparing them to
numbers in boat design books from the library. I want to put a description
of the design project on my website. I see lots of descriptions of amateur
building projects on websites, but none of an amateur design project.

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