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US 4,487,148 AGranted
Sailboat
AssigneeU.M. Corporation
InventorKazuhiro Umeda
Life of this patent
Estimating the term…
Abstract
A sailboat has a rotatable mast having a pivot mast for holding a sail and a slat member broadening backward from a leading edge to have a streamline section of a wing section together with the pivot mast and arranged along the pivot mast. The mast is rotated to be fixed at a desired position. Not only the sail but also the slat member produces a lift. The production of vortex and exfoliation of laminar layer are suppressed. Reefing and folding of the sail is facilitated.
Claims4
A sailboat comprising:
- (a) rotatable mast having a pivot mast for holding the front part of a sail, and for winding said sail therearound and a slat member broadening backward from a leading edge to have a section corresponding to a fore portion of a wing section working together with said pivot mast and arranged along said pivot mast;
- (b) base for rotatably supporting said pivot mast and said slat member, said slat member being detachably mounted on said base;
- and
- (c) means for rotating said base around the axis of said pivot mast, so that said mast can be directed to a direction of maximum lift and for fixing said base after the rotation at a desired position.
1 more element
Dependencies are inferred from the claim text.