| Bruce numbers
Dirk,
SAD (Sail Area / Displacement) ratios or Bruce numbers give a pretty good idea of the relative performance of catamarans.
As an example I have attached the results of the last ARC. Bruce numbers are given for lightship weights. The two Lagoon 440 were not last, the 420 fleet was behind !
The Catana 471 has a Bruce number of around 1.33 so will be faster than a Lagoon 440. Latest Catanas (Poncin era) are far heavier.
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