You were right. It is "1", not "l". It was showing that the
comparison graph in the book uses a sail pressure of 1 lb/sq ft,
or about 16 mph of wind.

I found a pretty good explination of the Dellenbaugh angle at
www.kastenmarine.com/sail_area_ratios.pfd. Its defined there as...

57.3 X sail area X heeling arm X wind pressure
----------------------------------------------
displacement X GM

where GM is the distance between the boat's centre of gravity and
its metacentre. I guess that would be a vertical distance.

it also say's its covered in Skene's Elements so I've requested a
copy from the public library.

the comparison graph I'm looking at has the displacement and GM
"corrected for half load condition", and also uses a specific way
of calculating the heeling arm. I don't know how to compute
heeling arm. I can get the (free BluePeter) computer program to
calculate a metacenter for a half load. I hope to find out how to
calculate the heeling moment in Skene's so I compare the sail plan
on the design I'm playing with to the graph. all very interesting.

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