Patent ID: 8281727

Claim:
A wind-propelled vehicle, comprising: a vertical mast assembly having a lower end rotatably mounted about a vertical axis on the vehicle; and a wing-sail carried by said vertical mast assembly for propelling the vehicle, said wing-sail including a fore sail panel defining a leading edge of the wing-sail, and a pair of aft sail panels defining sides and a trailing edge of the wing-sail; characterized in that said vertical mast assembly includes: a pair of vertically-extending posts joined together at their upper ends, diverging apart towards their lower ends, and connected together at said diverging lower ends to define a frame of an A-configuration; and a rotatable support for the diverging lower ends of the pair of posts to said vehicle; and a separate boom fixed to the lower end of each of said pair of posts connected to the aft sail panels of said wing-sail enabling each aft sail panel to be hoisted and reefed.