US3625459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil design
Assignee: Individual
•
Filing: 1970-05-18
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Granted: 1971-12-07
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Expires: 1990-05-18
Abstract
Abstract A new delta-wing aircraft wherein airflow effectively alters geometry with airspeed to produce high lift at low speed and lowinduced drag at high speed.
Inventors
- 👤 Walter C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:41
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
In combination, an elongated support member having a pair of upwardly projecting surface opposed walls defining an upwardly open space, a first lifting surface portion affixed in transverse relation to upper extremity portions of one in the pair of said walls in position thereon projecting beyond the space defined by said pair of walls, and second lifting surface portion affixed in transverse relation to the opposite wall of said support member; said first and second lifting surface portions having a leading edge in angularly disposed convergent relation to said main support member and having a trailing edge in transverse relation to each in the pair of wall portions of said support member, said trailing edge portions being in surface aligned relation to trailing edge portions of said central support member.
Claim 2
Dependent Claim
130 words
In combination, an elongated support member having a pair of upwardly projecting surface opposed walls defining an upwardly open space, a first lifting surface portion affixed in transverse relation to upper extremity portions of one in the pair of said walls in position thereon projecting beyond the space defined by said pair of walls, and second lifting surface portion affixed in transverse relation to the opposite wall of said support member; said first and second lifting surface portions having a leading edge in angularly disposed convergent relation to said main support member and having a trailing edge in transverse relation to each in the pair of wall portions of said support member, said trailing edge portions being in surface aligned relation to trailing edge portions of said central support member.
Claim 3
Dependent Claim
37 words
A delta-wing aircraft as claimed in claim 1, and in which leading edge and trailing edge of said first lifting surface portion and leading edge and trailing edge of said second lifting surface portion have sinusoidallike configuration.
Claim 4
Dependent Claim
119 words
A delta-wing aircraft as claimed in claim 2 and in which the sinusoidlike configuration of leading and trailing edges of said first and second lifting surface portions describe the chord extremities of longitudinal airfoil cross sections comprising an upper lifting surface of sinusoidlike configuration and an opposed lower lifting surface of sinusoidlike configuration; said upper lifting surface sinusoidlike configuration differing from said lower lifting surface sinusoidlike configuration in phase relationship, with said upper lifting surface sinusoidlike configuration in lagging phase relationship to said lower lifting surface sinusoidlike configuration; said lagging phase relationship being in reference to angular rotation in progression along the plane containing the cross section, with said progression in a direction parallel to the line of flight.
Claim 5
Dependent Claim
87 words
An airfoil or hydrofoil cross section comprising in combination an upper lifting surface having sinusoidlike configuration and an opposed lower lifting surface having sinusoidlike configuration, said upper lifting surface sinusoidlike configuration differing from said lower lifting surface sinusoidlike configuration in phase relationship with said upper sinusoidlike configuration in lagging phase relationship to said lower sinusoidlike configuration; said lagging phase relationship being in reference to angular rotation in progression along the plane containing the cross section with said progression in a direction parallel to the line of flight.
Claim 6
Dependent Claim
87 words
An airfoil or hydrofoil cross section comprising in combination an upper lifting surface having sinusoidlike configuration and an opposed lower lifting surface having sinusoidlike configuration, said upper lifting surface sinusoidlike configuration differing from said lower lifting surface sinusoidlike configuration in phase relationship with said upper sinusoidlike configuration in lagging phase relationship to said lower sinusoidlike configuration; said lagging phase relationship being in reference to angular rotation in progression along the plane containing the cross section with said progression in a direction parallel to the line of flight.
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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |