Here is some more info about the H16:

With it's legendary design and induction into the Sailing Hall of Fame, the Hobie 16 is truly in a class of its own. The 1996 Hobie 16 World Championship, held in The United Arab Emirates, drew over 300 teams from 55 countries competing on new, factory-supplied boats. In past Telex Regattas (the worlds largest multihull regatta) the H16 has won the event and even today with all the new so-called modern designs the Hobie 16 continues to win, placing first in its length and second overall in 2002. The Hobie 16 was the first multihull of any length, class, or design used for an official disAbled (Trapseat) World Championships. Thirty years of racing and going stronger than ever.
Powerful enough to challenge veteran sailors yet easy enough for beginners, the Hobie 16 is the perfect all-around cat.

The Hobie 16 very effectively protects the crew form spray, thanks to its banana shaped hulls and raised trampoline that is very high over the water. The ingenious hull design requires no centerboards and does not slide-slip in the water. The outer side of each hull is relatively flat, and the inner sides of each hull curves like an airplane wing to develop “lift,” in this case a horizontal force pulling the hull inwards. When the wind is dead astern or dead ahead the “lift” from each hull is perfectly opposed and cancel each other out and when the wind blows from any side, the leeward hull sinks deeper (more wing in the water) than the windward hull, and its “lift” towards windward dominates. Also due to this unique hull design the Hobie 16 is considered the undisputed king of the surf, no catamaran handles better in the surf. The standard Hobie 16 overall Portsmouth rating is 76.1, with Trapseats at 77.6, and the Turbo version provisional rating is at 70.5, all these ratings are without a spinnaker. New in 1997 were European designed (tighter fitting) corner castings, pylons and rudder gudgeons for improved sailing qualities. For those with disAbilities the Trapseat wing seats are the perfect addition. The ‘Trapseats’ bolt onto each side of the Hobie 16 easily and are comfortable for everyday cruising. And even people with the most challenging disabilities can sail a Hobie 16 with Trapseats with ease and on equal terms to those without disabilities. After 30 years the Hobie 16 is still the #1 rental and sailing school catamaran, due to its durability, speed, and meeting disAbilities requirements – the ADA (with addition of Trapseats). The fastest asymmetrical hulled centerboard-less (16’) cat in production. The Hobie 16.... The ultimate one design class, rental, and sailing school catamaran.

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I have also sailed G-Cat and when compared to other high performance cats I really felt no speed or performance advantages. Seems to be some interest in this cat and would be a good idea to ask Rick White to create a forum for the G-Cat as this is a H16 forum. I did go to the G-Cat website and forum and there were only a few post on the forum so maybe there is not enough interest in having such a forum. It did seem to indicate on the G-Cat website that they are still building it. Once again there is a forum on the G-Cat website.