| 摘要 |
A radial force sail (22) for propelling land or water craft includes a continuously curved anhedral section (24) having its tip portions interconnected with substantially rigid, dihedrally disposed struts (26) and (28) that converge towards each other and preferably intersect together at approximately the apex or center of curvature of the anhedral section. A manually manipulatable control bar (22) is secured to the struts (26) and (28) at their intersection with each other. Through the control bar, the sail may be rotated in the pitch, yaw and roll directions to control and quickly change the lifting and/or driving forces generated by the sail (22) substantially independently of each other or in unison.
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