Chad's got all the bases covered. The experimental boat was known as Venturi. It was multihull boat that was designed to have the actual air pressure raise the boat up out of the water. Not a foil hull, and not a hydro, yet kind of similar in principle to modern tunnel hull boats, in the that shape of the inner hull surfaces actually compresses the air that runs under it. Notice in the photo of Gar in the pool that Chad posted, the actual curved sides of the hull face inward, with the flat sliced sides of the hull outward. The curved hull sides created a venturi. See:
http://en.wikipedia.org/wiki/Venturi_effect
I read somewhere what Venturi was powered by. I cannot remember where I read. It seems like it might have been powered by Liberty's.
We actually have a 16mm film of this boat in action, and quite a feature film of Gar Wood himself. The film has been digitized, and will someday be released as our Archive Film Series DVD 2.
