| 摘要 |
A rigid foil sail having a full length vertical leading edge whose trim angle/angle of attack is controlled by the main sheet and trailing edge flaps attached rearwardly of the leading edge, each of which can be independently trimmed from a convenient deck level control tray to achieve easily adjustable camber. The design of the rigid foil sail allows depowering of the sail without altering mainsheet trim by decreasing the camber of the upper trailing flap thus also decreasing the heeling force created by the power of the upper trailing flap. Further, a void within the foil is filled with a lighter than air gas to assist in countering heeling moment to allow the boat to be driven without the loss of upwind pointing performance and without the loss of power and also allowing the boat to be driven to windward more efficiently with a minimum heel angle.
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