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Today I searched the ‘net to see how the discussions were going, and I came across this forum. Included are some pretty desired documents. One is a pair of papers by Andrew Bauer, arguably the true originator of the concept. One paper describes what is essentially a continuously tacking boat; the other is a boat with a water propeller connected to an air propeller, in which, depending on the direction of the boat relative to the wind, one drives the other or vice-versa.

Also interesting is a pair of analyses by renowned MIT professor Mark Drela. One is a derivation of the energy balance, applicable both to a cart or a boat, and the other, more complete analysis, is one based on efficiencies, the conclusion of which is that the cart should achieve speed faster than the wind relatively easily.

Case closed?

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