| 摘要 |
This specification discloses a rudderless sailing craft with two sails of approximately equal area and a vertical keel affixed to the hull near a balance point between the two sails. The central part of the craft between the two sails serves as an unobstructed cockpit area free of overhead sails and swinging booms. The craft is steered by controlling both sails simultaneously from the cockpit area using a mechanism consisting of either a single rope rigged to both sails or a steering wheel and gearbox with chain-drives which rotate the booms at the base of each sail. For steering, the mechanism differentially alters the trim angle of the two sails causing the force exerted by the wind to increase on one sail and to decrease on the other sail. The hydrodynamic force on the keel acts as a fulcrum about which the differential forces exerted by the sails provide the turning moment necessary for steering the craft. For changing coarse heading or adjusting the angle of heel, the mechanism trims the sails in unison.
|
