Is the sail plan limited by DOG?

I would say that the weight and sail plan would be more important than the number of hulls.

The BMWO tri probably is heavier, just because they have more hulls, and in light air, they have more wetted surface area, so if everything else is the same (total weight and sail area) then the cat is faster.

Whats the stats on the Alinghi cat? Its not listed on their website in any easy to find way. The BMWO tri stat's are listed prominently.

Fact Sheet - BMW ORACLE Racing 90.
Hull
Boat Type: Trimaran of carbon composite construction
Where Built: Core Builders, Anacortes, WA, USA
Hours to build: over 130,000 hours to date
Overall Length: 100-feet/30 meters
Waterline Length: 90-feet/27 meters
Beam: 90-feet/27 meters



Mast
Height: Up to 185-feet/55 meters
Where Built: Hall Spars, Bristol, RI, USA; Core Builders, Anacortes, WA, USA


Sails
Mainsail: 6800 square feet; (630m2)
Genoa: 6700 square feet; (620m2)
Gennaker: 8400 square feet; (780m2)