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Old 18th August 2011, 02:09 AM   #5
Join Date: Jan 2009
Location: Belgium
Posts: 509

The approximate surface area of modern race sails follows a little bit this formula:

Luff size x Real Boom size (you need to add the extra length to the reduced boom size) / 1.4

Floyd, for your sail examples, perhaps not real race sails but I don't care, and I presume no reduced boom length it sums up to:

4.58x1.90/1.4= 6.22 m2
4.70x1.98/1.4= 6.65 m2

So, for sure not 0.2 difference but rather 0.4 difference which is not that far away.
IS87 / IS101 / RRD114 / US147
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