Patent US3797434A successfully refreshed from Google Patents.
US3797434A
Expired / Lapsed
US
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Hydrofoil control means
Assignee: Individual
•
Filing: 1972-09-25
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Granted: 1974-03-19
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Expires: 1992-09-25
Abstract
Abstract An attitude control for a primary lifting hydroplane in the form of a control surface attached to the forward tip of the primary plane by a vertical support. The control plane maintains the primary plane at a fixed depth. Hydraulic dampers including stops control the rate and maximum amount of angular motion of the primary plane.
Inventors
- 👤 L Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:00
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/24; B63B1/28; B63B1/285
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
177 words
Apparatus for controlling the attitude of a hydrofoil comprising: means for pivotally mounting the hydrofoil so that the surface area aft of the pivot is greater than the surface area in front of the pivot whereby pressure against the larger area tends to cause a counter-clockwise rotation, forcing the tip of the hydrofoil down; a flat attitude control plane attached to the forward end of the hydrofoil by a straight vertical support; said attitude control plane being adjustably mounted with a slight upward angle with respect to the hydrofoil whereby a moment is generated when the attitude control moves through water, which tends to rotate the hydrofoil clockwise, forcing the tip up in opposition to the pressure against the larger area of the hydrofoil aft of the pivot; a pair of arms attached to the hydrofoil pivotally mounting means extending forward and aft and acting as stops to limit the maximum angle of incidence of the hydrofoil to 20*; and means attached to the aft extending arm for damping the angular rate of change of the hydrofoil.
Claim 2
Dependent Claim
177 words
Apparatus for controlling the attitude of a hydrofoil comprising: means for pivotally mounting the hydrofoil so that the surface area aft of the pivot is greater than the surface area in front of the pivot whereby pressure against the larger area tends to cause a counter-clockwise rotation, forcing the tip of the hydrofoil down; a flat attitude control plane attached to the forward end of the hydrofoil by a straight vertical support; said attitude control plane being adjustably mounted with a slight upward angle with respect to the hydrofoil whereby a moment is generated when the attitude control moves through water, which tends to rotate the hydrofoil clockwise, forcing the tip up in opposition to the pressure against the larger area of the hydrofoil aft of the pivot; a pair of arms attached to the hydrofoil pivotally mounting means extending forward and aft and acting as stops to limit the maximum angle of incidence of the hydrofoil to 20*; and means attached to the aft extending arm for damping the angular rate of change of the hydrofoil.
Claim 3
Dependent Claim
28 words
The apparatus of claim 1 wherein said damping means comprises a hydraulic cylinder incorporated in said aft extending arm and attached to the aft end of the hydrofoil.
References Cited (Backward Citations)
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US2597048A
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US2972974A
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US3081728A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |