US4015801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maneuverable, ram air inflated, flexible aerial wing
Assignee: Individual
•
Filing: 1975-10-30
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Granted: 1977-04-05
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Expires: 1995-10-30
Abstract
Abstract A maneuverable, ram air inflated, flexible aerial wing includes a plurality of adjacent, forward facing air cells having first openings along the leading edge thereof and a control surface extending between the aforesaid cells and the trailing edge. Generally rectangular in overall shape the cells are of such size and so positioned, and include rearward facing second openings, as to displace the separation point of the relative airflow across the upper surface further toward the trailing edge than with known devices, and which therefore achieves a higher lift to drag ratio. Further, the control line system and a series of rear vents combine to reduce the force required to lower the surface and help prevent erratic flight.
Inventors
- 👤 William H. Womble
- 👤 John D. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:23
CPC Classifications
B; B64; B64D; B64D17/00; B64D17/02; B64D17/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
Improvements in ram air inflated parachutes of the type comprising a canopy formed of a flexible, non-porous fabric having a leading edge and a trailing edge, and a plurality of forwardly facing transversely adjacent air cells having an upper wall and a lower wall and extending from said leading edge toward said trailing edge and terminating along a cell termination line formed by the joining of said upper and lower walls, said improvements comprising means for displacing the separation point of the relative airflow over the upper surface of said canopy toward said trailing edge and providing more lift, said means comprising a transverse opening in the upper wall of at least some of said cells, said opening being positioned forwardly of said termination line and having the effect of moving said separation point further rearwardly toward said trailing edge.
Claim 2
Dependent Claim
140 words
Improvements in ram air inflated parachutes of the type comprising a canopy formed of a flexible, non-porous fabric having a leading edge and a trailing edge, and a plurality of forwardly facing transversely adjacent air cells having an upper wall and a lower wall and extending from said leading edge toward said trailing edge and terminating along a cell termination line formed by the joining of said upper and lower walls, said improvements comprising means for displacing the separation point of the relative airflow over the upper surface of said canopy toward said trailing edge and providing more lift, said means comprising a transverse opening in the upper wall of at least some of said cells, said opening being positioned forwardly of said termination line and having the effect of moving said separation point further rearwardly toward said trailing edge.
Claim 3
Dependent Claim
39 words
The improvements according to claim 1 wherein said air cells extend only partially of the longitudinal distance between said leading edge and said trailing edge, thereby forming a forward partial cell section and a rear, single membrane control surface.
Claim 4
Dependent Claim
49 words
The improvements according to claim 2 and further including a plurality of second openings through the control surface along a line spaced from and parallel to said trailing edge to reduce the force necessary to lower the trailing edge and prevent erratic flight upon change of angle of attack.
References Cited (Backward Citations)
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US3428277A
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US3524613A
Cited
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |