US3785319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrofoil vessel
Assignee: Individual
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Filing: 1971-06-11
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Granted: 1974-01-15
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Expires: 1991-06-11
Abstract
Abstract A canard type hydrofoil vessel utilizing a lightly loaded bow foil unit to act as a pitch suppressor to oncoming waves in conjunction with dual main foil units. The bow foil unit supports approximately 15 to 25 percent of the weight of the vessel and the main foil units support approximately 75 to 85 percent of the weight of the vessel when the vessel is foilborne.
Inventors
- 👤 L Danforth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:11
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A canard type hydrofoil vessel, comprising: a hull; single bow foil means depending from the front portion of said hull and supporting approximately 15 to 25 percent of the weight of the vessel when said hull is foil-borne; dual main foil means depending from opposite sides of the afterbody portion of said hull, each main foil means including a strut, a main take-off foil on said strut and a fully submerged main lift foil below said take-off foil, with said main lift foils supporting approximately 75-85 percent of the weight of the vessel when said hull is foilborne; and a propulsion unit disposed on the lower end of each of said struts immediately above the main lift foils.
Claim 2
Dependent Claim
118 words
A canard type hydrofoil vessel, comprising: a hull; single bow foil means depending from the front portion of said hull and supporting approximately 15 to 25 percent of the weight of the vessel when said hull is foil-borne; dual main foil means depending from opposite sides of the afterbody portion of said hull, each main foil means including a strut, a main take-off foil on said strut and a fully submerged main lift foil below said take-off foil, with said main lift foils supporting approximately 75-85 percent of the weight of the vessel when said hull is foilborne; and a propulsion unit disposed on the lower end of each of said struts immediately above the main lift foils.
Claim 3
Dependent Claim
78 words
A hydrofoil vessel as set forth in claim 1 wherein said struts extend downwardly and outboard of the sides of said hull, said main take-off foils extend downwardly and outboard of the upper portion of said struts, a stabilizer foil extends outwardly and upwardly relative to the lower portion of each strut and intersects the lower portion of each main take-off foil, and a main lift foil is secured to the lower end of each of said struts.
Claim 4
Dependent Claim
68 words
A hydrofoil vessel as set forth in claim 1 wherein said bow foil means includes an upper pair of outwardly and downwardly inclined sub-cavitating high-lift bow take-off foils that extend from the sides of said hull and are connected at their lower ends to a dihedral stabilizer and lifting foil, with the lower portion of said stabilizer and lifting foil being submerged during foilborne speeds of said vessel.
Claim 5
Dependent Claim
36 words
A hydrofoil vessel as set forth in claim 1 wherein a downwardly and outwardly extending stop foil is provided at the lower end of each of said main take-off foils to suppress roll of said hull.
Claim 6
Dependent Claim
41 words
A hydrofoil vessel as set forth in claim 1 wherein said main take-off foils are inclined downwardly and outwardly from their inner ends, with the angle of incidence of said take-off foils and said stabilizing foils decreasing with the draft thereof.
Claim 7
Dependent Claim
30 words
A hydrofoil vessel as set forth in claim 1 wherein a propulsion element is disposed on the lower end of each of said struts immediately above the main lift foils.
Claim 8
Dependent Claim
19 words
A hydrofoil vessel as set forth in claim 1 wherein flap means are provided on said main lift foils.
Claim 9
Dependent Claim
32 words
A hydrofoil vessel as set forth in claim 1 wherein said main take-off foils, stabilizing foils and main lift foils each embody rake, sweep and incline to assist in shedding of debris.
Claim 10
Dependent Claim
21 words
A hydrofoil vessel as set forth in claim 1 wherein a cavitation plate is positioned above each of said propulsion elements.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |