Patent US5746253A successfully refreshed from Google Patents.
US3868073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propulsion system for aircraft
Assignee: Individual
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Filing: 1974-01-30
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Granted: 1975-02-25
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Expires: 1994-01-30
Abstract
Abstract An aircraft having pairs of upper and lower air foils projecting from opposite sides of the fuselage, with upper and lower arcuate portions defining a pair of air ducts. A propeller is rotatably mounted behind each air duct so that the path of the propeller tips is above the respective trailing edges of the upper arcuate air foils. The upper arcuate air foils merge to form a trough which air is pulled by the propeller tips rotating toward each other.
Inventors
- 👤 Myron L King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:26
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/06; B64C39/066
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A propulsion system for aircraft comprising: a. a fuselage having a front-to-rear longitudinal axis, b. an upper air foil fixed to said fuselage and having a leading edge and a trailing edge, c. said upper air foil extending arcuately, convex upward, transversely of said fuselage, d. a lower air foil fixed to said fuselage, having a leading edge and a trailing edge, and spaced substantially vertically below said upper air foil, e. said lower air foil extending arcuately, convex downward, transversely of said fuselage, so that the opposed, spaced, concave surfaces of said air foils generally form an air duct, f. a rotary propeller having blade tips, g. means rotatably mounting said propeller behind said duct and adjacent the trailing edges of said air foils so that the rotary path of said propeller tips is above the trailing edge of said upper foil, but not below the trailing edge of said lower air foil, and h. means for driving said propeller.
Claim 2
Dependent Claim
161 words
A propulsion system for aircraft comprising: a. a fuselage having a front-to-rear longitudinal axis, b. an upper air foil fixed to said fuselage and having a leading edge and a trailing edge, c. said upper air foil extending arcuately, convex upward, transversely of said fuselage, d. a lower air foil fixed to said fuselage, having a leading edge and a trailing edge, and spaced substantially vertically below said upper air foil, e. said lower air foil extending arcuately, convex downward, transversely of said fuselage, so that the opposed, spaced, concave surfaces of said air foils generally form an air duct, f. a rotary propeller having blade tips, g. means rotatably mounting said propeller behind said duct and adjacent the trailing edges of said air foils so that the rotary path of said propeller tips is above the trailing edge of said upper foil, but not below the trailing edge of said lower air foil, and h. means for driving said propeller.
Claim 3
Dependent Claim
60 words
The invention according to claim 1 in which the arcuate portions of the trAiling edges of both said air foils form circular arcs, each of said arcs being concentric with the rotary axis of said propeller, and the arc of the trailing edge of the lower air foil having a radius substantially equal to the radius of said propeller tips.
Claim 4
Dependent Claim
81 words
The invention according to claim 1 in which said upper air foil comprises a right upper air foil projecting from the right side of said fuselage and a left upper air foil projecting from the left side of said fuselage, said lower air foil comprising a right lower air foil projecting from the right side of said fuselage and a left lower air foil projecting from the left side of said fuselage, said propeller comprising a right propeller and left propeller.
Claim 5
Dependent Claim
73 words
The invention according to claim 3 in which said right and left upper air foils converge to form a longitudinal trough concave upward, the rotary paths of said propeller tips being adjacent each other, and the means for driving said propellers being adapted to drive said propellers in opposite directions so that said right and left propeller tips move toward each other when moving along the trailing edges of said upper air foils.
Claim 6
Dependent Claim
18 words
The invention according to claim 4 in which said trough comprises a top surface portion of said fuselage.
Claim 7
Dependent Claim
12 words
The invention according to claim 4 in which said trough declines rearward.
Claim 8
Dependent Claim
52 words
The invention according to claim 3 in which the portions of all said air foils fixed adjacent said fuselage comprise the arcuate portions forming said left and right ducts, said air foils further comprising substantially planar wing members projecting transversely outward and rigid with said arcuate portions to form biplane wing members.
Claim 9
Dependent Claim
47 words
The invention according to claim 7 further comprising right and left planar aileron members, means hinging said right aileron member to the outer end of said upper right wing member, and means hinging said left aileron member to the outer end of said left upper wing member.
Claim 10
Dependent Claim
22 words
The invention according to claim 8 in which each of said aileron members comprises baffle portions projecting inward behind the corresponding propellers.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |