US5156353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft pylon
Assignee: General Electric Co
•
Filing: 1987-04-13
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Granted: 1992-10-20
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Expires: 2007-04-13
Abstract
Abstract An aircraft propulsion system includes at least one pusher propeller mounted to a nacelle mounted to the aircraft by a pylon which produces a wake which impinges upon the propeller. The wake from the pylon is modified to reduce noise and vibration produced by the propeller interaction with the wake. The propulsion system may include a pair of counterrotating pusher propellers.
Inventors
- 👤 Philip R. Gliebe
- 👤 Rudramuni K. Majjigi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:49
CPC Classifications
B; B64; B64D; B64D29/00; B64D29/04; B64C; B64C21/00; B64C21/02; B64C21/025; B64D27/00; B64C2230/00; B64C2230/04; B64C2230/06; B64C2230/14; B64C2230/22; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
In an aircraft propulsion system which comprises at least one pusher propeller located downstream of a pylon, which produces turbulence which the propeller ingests, the improvement comprising: (a) means for modulating the turbulence produced by the pylon, and (b) control means for controlling the modulation of (a) in response to flight conditions, including different angles of attack of the aircraft.
Claim 2
Dependent Claim
60 words
In an aircraft propulsion system which comprises at least one pusher propeller located downstream of a pylon, which produces turbulence which the propeller ingests, the improvement comprising: (a) means for modulating the turbulence produced by the pylon, and (b) control means for controlling the modulation of (a) in response to flight conditions, including different angles of attack of the aircraft.
Claim 3
Dependent Claim
27 words
A system in accordance with claim 1 in which the means of (a) comprises a source for injecting a gas near the trailing edge of the pylon.
Claim 4
Dependent Claim
25 words
A system according to claim 1 in which the means of (a) comprises perforations in the surface of the pylon for controlling boundary layer thickness.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |