US3820719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engines
Assignee: Rolls Royce PLC
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Filing: 1973-04-30
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Granted: 1974-06-28
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Expires: 1993-04-30
Abstract
Abstract A fan type gas turbine engine for use in an aircraft, the engine having a fan cowl comprising at least two annular parts, one part being axially separable from the remainder of the fan cowl to provide an annular opening giving additional nozzle area during take-off conditions and being shaped to promote attachment of the extra nozzle flow to its outer surface; and, if the fan is a variable pitch fan, the additional nozzle area can serve as additional intake area for the fan during operation in the reverse pitch mode.
Inventors
- 👤 K Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/09; F02K1/54; F02K1/64; F02K1/66
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
A nozzle for a ducted fan gas turbine engine having fan cowl means defining the nozzle area, means for relatively axially separating an upstream portion and a downstream portion of the fan cowl means to define an opening therebetween, means for directing a portion of the nozzle flow through said opening and for promoting attachment of the nozzle flow to the outer surface of the said dowNstream portion.
Claim 2
Dependent Claim
68 words
A nozzle for a ducted fan gas turbine engine having fan cowl means defining the nozzle area, means for relatively axially separating an upstream portion and a downstream portion of the fan cowl means to define an opening therebetween, means for directing a portion of the nozzle flow through said opening and for promoting attachment of the nozzle flow to the outer surface of the said dowNstream portion.
Claim 3
Dependent Claim
24 words
A nozzle for a gas turbine engine according to claim 1 and wherein the said ducted fan engine comprises a variable pitch fan engine.
Claim 4
Dependent Claim
31 words
A nozzle for a gas turbine engine according to claim 2 and wherein the said opening in the fan cowl means defines intake means for reversed thrust operation of the fan.
Claim 5
Dependent Claim
40 words
A nozzle for a gas turbine engine according to claim 3 wherein the size of said opening when operating as a nozzle differs from the size of said opening when defining intake means for reversed thrust operation of the fan.
Claim 6
Dependent Claim
29 words
A nozzle according to claim 1 and comprising guide rail means for supporting one of said upstream or downstream portions for movement relative to the other of said portions.
Claim 7
Dependent Claim
20 words
A nozzle according to claim 1 and comprising recirculating ball jack means for separating the said upstream and downstream portions.
Claim 8
Dependent Claim
17 words
A nozzle according to claim 1 and including sealing means between the said axially relatively separable portions.
Claim 9
Dependent Claim
92 words
A nozzle for a variable pitch fan engine comprising a fan cowl which together with a core engine defines the nozzle area, the fan cowl having an upstream portion and first and second downstream portions characterised in that there is provided means for relatively axially separating the second downstream portion from the upstream and first downstream portion to provide additional nozzle area and means for separating the first and second downstream portions from the upstream portion to define an opening, the opening defining intake means for reversed thrust operation of the fan.
Claim 10
Dependent Claim
92 words
A nozzle for a variable pitch fan engine comprising a fan cowl which together with a core engine defines the nozzle area, the fan cowl having an upstream portion and first and second downstream portions characterised in that there is provided means for relatively axially separating the second downstream portion from the upstream and first downstream portion to provide additional nozzle area and means for separating the first and second downstream portions from the upstream portion to define an opening, the opening defining intake means for reversed thrust operation of the fan.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |