US3706430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil for aircraft
Assignee: Individual
•
Filing: 1970-03-17
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Granted: 1972-12-19
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Expires: 1990-03-17
Abstract
Abstract An airfoil for fixed and rotary wing aircraft comprising a continuous upper surface that joins with a generally planar portion of the under surface at the leading edge to form the apex of a wedge-like airfoil section that extends toward and terminates abruptly in advance of the trailing edge.
Inventors
- 👤 Richard L Kline
- 👤 Floyd F Fogleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:33
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/10; B64C3/14; B64C2003/142; B64C2003/148
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
An aircraft wing that is connected at its root end to the aircraft, comprising: a. a main, generally flat portion, one side of which constitutes a continuous positive camber surface of the wing, b. the opposite side of the wing defining a negative camber surface that is formed in part by the main portion and in part by a wedge-shape portion joined to said main portion, c. the wedge apex coinciding with one edge of said main portion to define the leading edge of said wing and the transversely opposite edge of said main portion defining the trailing edge of said wing, d. and the wedge portion terminating along a base line materially in advance of the trailing edge for defining a steplike discontinuity that is an essential aerodynamically functional part of the negative camber surface of the wing, the width of the wedge portion from the leading edge to the base line at a respective chord decreasing according to the chord distance from the wing tip.
Claim 2
Dependent Claim
167 words
An aircraft wing that is connected at its root end to the aircraft, comprising: a. a main, generally flat portion, one side of which constitutes a continuous positive camber surface of the wing, b. the opposite side of the wing defining a negative camber surface that is formed in part by the main portion and in part by a wedge-shape portion joined to said main portion, c. the wedge apex coinciding with one edge of said main portion to define the leading edge of said wing and the transversely opposite edge of said main portion defining the trailing edge of said wing, d. and the wedge portion terminating along a base line materially in advance of the trailing edge for defining a steplike discontinuity that is an essential aerodynamically functional part of the negative camber surface of the wing, the width of the wedge portion from the leading edge to the base line at a respective chord decreasing according to the chord distance from the wing tip.
Claim 3
Dependent Claim
58 words
An aircraft wing as specified in claim 1 wherein the positive camber profile from the leading edge to the trailing edge at a chord section of the wing is essentially linear, and the positive camber surface extending between the root and tip ends of the wing is slightly convex with respect to the longitudinal axis of the wing.
Claim 4
Dependent Claim
43 words
An aircraft wing as specified in claim 1 wherein the leading edge of which is positioned at a swept-back angle, and the base line of the wedge portion extends toward the wing tip in a converging direction with respect to the leading edge.
Claim 5
Dependent Claim
33 words
An aircraft wing as specified in claim 1 wherein the wedge apex angle throughout the leading edge is substantially constant, coincident with change in width of the wedge portion at respective chord sections.
Claim 6
Dependent Claim
32 words
An aircraft wing as specified in claim 2 wherein the wedge apex angle varies from a maximum at an intermediate part of the leading edge to a minimum at the wing tip.
Claim 7
Dependent Claim
27 words
An aircraft wing as specified in claim 5 wherein the positive and negative camber surfaces between the root and tip ends of the wing have slight convexity.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |