US3720180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raffe sail for boats
Assignee: Individual
•
Filing: 1970-11-27
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Granted: 1973-03-13
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Expires: 1990-11-27
Abstract
Abstract A sail for a boat rigged to present a horizontal rather than a vertical luff. The sail is triangular, one edge being attached to a yard which is supported from a mast in a horizontal position. The yard is formed as an air foil so that the horizontal luff produces a lifting force on the yard. One apex of the triangular sail is sheeted so that it bellies out with the upper part extending forwardly so that the wind pressure produces an upward thrust on an area of the sail tending to lift the bow of the boat.
Inventors
- 👤 P Stangeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:15
CPC Classifications
B; B63; B63H; B63H9/00; B63H9/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
For use with a sailing vessel, a sail rigged to a mast, the sail being constructed and arranged to extend a substantial distance laterally and generally horizontally at the upper part of the sail, the lower part of the sail having sheeting means whereby to cause the sail to belly forwardly with an area at the upper part of the sail extending forwardly so that the wind pressure exerts an upward thrust on the sail causing the sheeting means to lift the bow of the vessel, said upper edge part of the sail being positioned to provide a horizontal luff, a laterally positioned yard to which the sail is secured, the yard being supported from a mast, said yard being formed as an air foil whereby the horizontal luff provides a lifting force on the yard and the upper part of the sail.
Claim 2
Dependent Claim
143 words
For use with a sailing vessel, a sail rigged to a mast, the sail being constructed and arranged to extend a substantial distance laterally and generally horizontally at the upper part of the sail, the lower part of the sail having sheeting means whereby to cause the sail to belly forwardly with an area at the upper part of the sail extending forwardly so that the wind pressure exerts an upward thrust on the sail causing the sheeting means to lift the bow of the vessel, said upper edge part of the sail being positioned to provide a horizontal luff, a laterally positioned yard to which the sail is secured, the yard being supported from a mast, said yard being formed as an air foil whereby the horizontal luff provides a lifting force on the yard and the upper part of the sail.
Claim 3
Dependent Claim
143 words
For use with a sailing vessel, a sail rigged to a mast, the sail being constructed and arranged to extend a substantial distance laterally and generally horizontally at the upper part of the sail, the lower part of the sail having sheeting means whereby to cause the sail to belly forwardly with an area at the upper part of the sail extending forwardly so that the wind pressure exerts an upward thrust on the sail causing the sheeting means to lift the bow of the vessel, said upper edge part of the sail being positioned to provide a horizontal luff, a laterally positioned yard to which the sail is secured, the yard being supported from a mast, said yard being formed as an air foil whereby the horizontal luff provides a lifting force on the yard and the upper part of the sail.
Claim 4
Dependent Claim
143 words
For use with a sailing vessel, a sail rigged to a mast, the sail being constructed and arranged to extend a substantial distance laterally and generally horizontally at the upper part of the sail, the lower part of the sail having sheeting means whereby to cause the sail to belly forwardly with an area at the upper part of the sail extending forwardly so that the wind pressure exerts an upward thrust on the sail causing the sheeting means to lift the bow of the vessel, said upper edge part of the sail being positioned to provide a horizontal luff, a laterally positioned yard to which the sail is secured, the yard being supported from a mast, said yard being formed as an air foil whereby the horizontal luff provides a lifting force on the yard and the upper part of the sail.
Claim 5
Dependent Claim
21 words
A sail as in claim 1, including spoiler means at the extremeties of the yard to prevent vortexes and eddy currents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |