US3815848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic lifting systems
Assignee: Individual
•
Filing: 1972-06-28
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Granted: 1974-06-11
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Expires: 1992-06-28
Abstract
Abstract The present invention relates to a method and apparatus for reducing the drag, and thereby increasing the ratio of lift/drag of supersonic wings above that achievable with conventional swept wings. The invention is characterized by the fact that the drag reduction is achieved as a result of a mutual interaction among multiple lifting surfaces in a manner which results in lower drag than is achieved by a single lifting surface at the same lift.
Inventors
- 👤 M Alperin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
113 words
A supersonic lifting system comprised of at least two wing elements, each element having a chord length at any given spanwise location different from that of its next adjacent element at the same spanwise location; the leading edge of the smaller element of any pair of elements being located immediately downstream of the shock wave emanating from the larger element of the pair of elements; and the leading edge slope of the surface of the smaller element which is adjacent to the larger element of the pair of elements is oriented in a substantially parallel relationship to the leading edge slope of the surface of the larger element of the pair of elements.
Claim 2
Dependent Claim
113 words
A supersonic lifting system comprised of at least two wing elements, each element having a chord length at any given spanwise location different from that of its next adjacent element at the same spanwise location; the leading edge of the smaller element of any pair of elements being located immediately downstream of the shock wave emanating from the larger element of the pair of elements; and the leading edge slope of the surface of the smaller element which is adjacent to the larger element of the pair of elements is oriented in a substantially parallel relationship to the leading edge slope of the surface of the larger element of the pair of elements.
Claim 3
Dependent Claim
101 words
A supersonic lifting system according to claim 1, in which the trailing edge of the smaller element of any pair of elements, at any spanwise location, is in close proximity to the leading ray of the expansion wave from the surface of the larger element of the pair of elements which is adjacent to the smaller element of the pair of elements; and in which the trailing edge of the larger element of the pair of elements is in close proximity to the leading ray of the expansion wave from the surface of the smaller element of the pair of 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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |