Some of the primary requirements for the design of wing sails are discussed. In particular, the requirements for maximizing thrust when sailing to windward and tacking down wind are presented. The results of water channel tests on six sail section shapes are also presented. These test results include the data for the double slotted flapped wing sail designed by Mr. David Hubbard for Mr. A. F. Di Mauro's IYRU "c" class catamaran PATIENT LADY II.

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