Patent ID: 6032603
Filing Date: 2000-03-07
Classification: B63B

Abstract:
Method for increasing the forward movement of a tacking sailing vessel which is driven by a wind force vector in a favorable forward direction and in an unfavorable leeward drift direction and having at least one submergible appendage with a cambered surface and a less cambered surface so that said appendage generates a lift force vector when water passes thereover including the steps of selectively shaping said cambered surface on said appendage to provide a high lift/drag ratio for said appendage so that the amount of wasted energy being saved is substantial when the sailing vessel drifts leewardly is equal to the difference between the wind force vector in said leeward drift direction and the lift force vector times the reduced leeward drift distance in a given period of time resulting from the reduced wind force vector in said leeward drift direction by said lift force vector, such multiplication product being greater than the amount of the incremental increase in the wasted drag energy by water passing over said appendage plus the lost entropy energy associated with the energy transfer, said saved energy increasing the forward speed of the sailing yacht because energy cannot be destroyed, and selectively adjusting the position of said appendage longitudinally on the hull relative to a center of the wind pressure upon the sails of said sailing vessel to controllably move a center of water pressure upon the appendage for producing a selected amount of weather helm for offsetting the undesirable lee helm upon the sailing vessel produced by said lift force vector acting upon the appendage.