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US3561702A
Expired / Lapsed
US
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Swept wing variable pitch sailplane
Assignee: Individual
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Filing: 1968-11-01
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Granted: 1971-02-09
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Expires: 1988-11-01
Abstract
Abstract A sailplane is provided in which the line-of-lift of the wing is swept back from the longitudinal elastic axis to give an automatic wing twist with change of lifting force. In operation, a reduction in the angle of incidence from an updraught wind results in a trade of lift for greater forward thrust. An increase in angle of incidence from a downdraught wind results in a trade of forward momentum for greater lift. This is most effective under turbulent air conditions.
Inventors
- 👤 Edward B Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:32
CPC Classifications
B; B64; B64C; B64C31/00; B64C31/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
56 words
A sweptwing, variable pitch sailplane, comprising, structure having a fuselage and a sweptback wing rigidly affixed to each side of said fuselage, with the line of lift of each said wing being sweptback from the longitudinal line of twist to give an automatic wing twist with change of lifting forces on the wing of said sailplane.
Claim 2
Dependent Claim
56 words
A sweptwing, variable pitch sailplane, comprising, structure having a fuselage and a sweptback wing rigidly affixed to each side of said fuselage, with the line of lift of each said wing being sweptback from the longitudinal line of twist to give an automatic wing twist with change of lifting forces on the wing of said sailplane.
Claim 3
Dependent Claim
29 words
The sailplane structure as recited in claim 1, wherein said line of twist is positioned forwardly of said line of lift at any predetermined angle between 0* and 90*.
Claim 4
Dependent Claim
29 words
The sailplane structure as recited in claim 1, wherein said line of twist is positioned forwardly of said line of lift and passes through the tip of said wing.
Claim 5
Dependent Claim
124 words
In combination, structure defining a sailplane having a fuselage and a sweptback wing rigidly affixed to each side of said fuselage, each said wing having a line of lift positioned substantially parallel to said wing along which all lifting forces are considered to be concentrated and a line of twist extending outwardly from the wing root lying in substantially the same plane as said wing about which all parts of the tip of said wing rotate to keep the same relative orientation with said wing tip when a net vertical force imposed in flight of said sailplane is applied to the upper as well as the lower surface of said wing, with said line of twist being positioned forwardly of said line of lift.
Claim 6
Dependent Claim
124 words
In combination, structure defining a sailplane having a fuselage and a sweptback wing rigidly affixed to each side of said fuselage, each said wing having a line of lift positioned substantially parallel to said wing along which all lifting forces are considered to be concentrated and a line of twist extending outwardly from the wing root lying in substantially the same plane as said wing about which all parts of the tip of said wing rotate to keep the same relative orientation with said wing tip when a net vertical force imposed in flight of said sailplane is applied to the upper as well as the lower surface of said wing, with said line of twist being positioned forwardly of said line of lift.
Claim 7
Dependent Claim
29 words
The sailplane structure as recited in claim 4, wherein said line of twist is positioned forwardly of the line of lift at any predetermined angle between 0* and 90*.
Claim 8
Dependent Claim
29 words
The sailplane structure as recited in claim 4, whereiN said line of twist is positioned forwardly of said line of lift and passes through the tip of said wing.
References Cited (Backward Citations)
US2709052A
Cited
US3438597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |