US3684857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intakes
Assignee: Rolls Royce PLC
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Filing: 1971-01-29
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Granted: 1972-08-15
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Expires: 1991-01-29
Abstract
Abstract A gas turbine engine air intake designed to prevent ingestion into the engine of a substantial proportion of any ice or slush present in the incoming air. The air intake comprises a central bullet and an outer casing defining an annular passage therebetween through which air flows to the engine compressor. The central bullet is enlarged at its upstream end to a mushroom shape whose outer periphery lies upstream of and is at a greater radius than the leading edge of the outer casing. In operation the ice and slush is deflected by reason of its greater momentum around the outside of the engine cowl and out of the path of the air drawn into the annular passage.
Inventors
- 👤 Frederick William Walto Morley
- 👤 George Henry Bennett
- 👤 Richard George Harvey
- 👤 Alan Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:55
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
An air intake for a gas turbine engine comprising an outer casing having a leading edge, a central bullet having an upstream end portion which is enlarged, an annular passage defined between said central bullet and said outer casing and adapted to receive a flow therethrough of air in a determined direction, said enlarged portion having an upstream surface which is convex forming a dome and having an outer periphery which is forward of the leading edge of the outer casing and every point on said periphery lies at a greater distance from the central axis of the intake than its corresponding point in the same axial plane on the leading edge of the outer casing.
Claim 2
Dependent Claim
116 words
An air intake for a gas turbine engine comprising an outer casing having a leading edge, a central bullet having an upstream end portion which is enlarged, an annular passage defined between said central bullet and said outer casing and adapted to receive a flow therethrough of air in a determined direction, said enlarged portion having an upstream surface which is convex forming a dome and having an outer periphery which is forward of the leading edge of the outer casing and every point on said periphery lies at a greater distance from the central axis of the intake than its corresponding point in the same axial plane on the leading edge of the outer casing.
Claim 3
Dependent Claim
20 words
An air intake according to claim 1, in which the enlarged portion of the central bullet is of circular cross-section.
Claim 4
Dependent Claim
25 words
An air intake according to claim 1, additionally comprising means for heating surfaces of the air intake which are exposed to a flow of air.
Claim 5
Dependent Claim
34 words
An air intake according to claim 3 in which said heating means comprise electrical resistance coils which are held in position on said surfaces by a matting material which is bonded to said surfaces.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |