US3801048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing drag of vertical takeoff type aircraft
Assignee: Vereinigte Flugtechnische Werke Fokker GmbH
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Filing: 1971-06-23
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Granted: 1974-04-02
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Expires: 1991-06-23
Abstract
Abstract Method of reducing drag on an aircraft of the vertical takeoff variety and having a particular power plant for production of vertical thrust as well as a main engine for producing forward thrust during aerodynamic flight; the vertical thrust producing power plant is used as power source for controlling the boundary layer flow along at least part of the surface of the aircraft during aerodynamic flight, residual thrust of that plant is deflected to contribute to forward thrust, supplementing the forward thrust produced by the main engine.
Inventors
- 👤 R Riccius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:52
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0041; B64C29/005; B64C21/00; B64C21/02; B64C21/025; B64C2230/00; B64C2230/04; B64C2230/22; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
Method of reducing drag of an aircraft of the vertical takeoff variety and having main engine means for producing forward thrust during aerodynamic flight and having a power plant, separately from the main engine means, for production of vertical thrust, comprising the steps of using an ejector pump for extracting suction power from the vertical thrust producing power plant; controlling the boundary layer flow along at least part of the surface of the aircraft during aerodynamic flight, without affecting the main engine means, by using the suction power as extracted by the ejector pump for sucking air through said surface part; and providing concurrently exhaust jet deflection in the vertical thrust providing power plant to contribute to forward thrust by supplementing the forward thrust provided by the main engine means.
Claim 2
Dependent Claim
130 words
Method of reducing drag of an aircraft of the vertical takeoff variety and having main engine means for producing forward thrust during aerodynamic flight and having a power plant, separately from the main engine means, for production of vertical thrust, comprising the steps of using an ejector pump for extracting suction power from the vertical thrust producing power plant; controlling the boundary layer flow along at least part of the surface of the aircraft during aerodynamic flight, without affecting the main engine means, by using the suction power as extracted by the ejector pump for sucking air through said surface part; and providing concurrently exhaust jet deflection in the vertical thrust providing power plant to contribute to forward thrust by supplementing the forward thrust provided by the main engine means.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |