Ships – Sail or control means therefor – Specific sail structure or arrangement
Patent
1991-07-15
1993-01-12
Sotelo, Jesus D.
Ships
Sail or control means therefor
Specific sail structure or arrangement
114103, B63H 906
Patent
active
051780860
ABSTRACT:
High performance sail craft operate in high apparent wind velocities which induce high aerodynamic loads into the said surface. This invention provides a light weight sail construction that resists deformation of the sail surface caused by high aerodynamic loads. The sail construction consists mainly of ribs permanently affixed to the sail surface to stretch the sail material. Each rib in the sail provides the required amount of stretch in the sail material to eliminate stretch folds in the sail surface. Each rib in the sail has the stiffness or resistance to flexure varying along its length to control the sail surface curvature thereby providing a low drag airfoil for high speed sailing. A double surface sail construction is provided wherein each sail surface consists of the aforemention sail construction. A parabolic nose forms the leading edge of the double surface sail to provide smooth air flow entry. The rearward end of each sail surface is joined to form the sail trailing edge. Water drain passages are provided at the trailing and foot of the double surface sail.
REFERENCES:
patent: 3581698 (1971-06-01), Bete
patent: 4699073 (1987-10-01), Farneti
patent: 4708079 (1987-11-01), Magnan
patent: 4733624 (1988-03-01), Belvedere
patent: 4766831 (1988-08-01), Johnston
patent: 4834013 (1989-05-01), Smart
patent: 4856447 (1989-08-01), Magnan
patent: 4864953 (1989-09-01), Allsopp et al.
patent: 4924794 (1990-05-01), Duke
patent: 5038699 (1991-08-01), Cochran et al.
Avila Stephen P.
McCarthy Jack N.
Sotelo Jesus D.
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