US3837602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mountings for power plants
Assignee: Rolls Royce PLC
•
Filing: 1973-02-26
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Granted: 1974-09-24
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Expires: 1993-02-26
Abstract
Abstract An aircraft is provided with overwing mounted ducted fan gas turbine engines, the engines being mounted within nacelles formed on the upper surface of the wing main spar. The nacelles provide a part of the engines fan flow ducts and also provide attachment points to which the engines are attached in a manner which transmits thrust loads directly to the wing main spar.
Inventors
- 👤 J Mullins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:51
CPC Classifications
B; B64; B64D; B64D27/00; B64D27/02; B64D27/16; B64D27/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
In combination with a wing structure having a main spar, an arrangement for mounting above said wing structure at least one ducted fan engine of the type comprising a gas generator core engine having a casing, a station of fan blades forward of said casing, and a cowl surrounding said station of fan blades and defining a portion of a fan duct surrounding said casing, said arrangement comprising: a nacelle extending about said at least one ducted fan engine and spaced from the casing of said gas generator core engine to define a remaining portion of said fan duct; means for supporting said nacelle from an upper surface of said main wing spar; and a first attachment means to fixedly support said ducted fan engine from said nacelle at a position on said nacelle remote from said nacelle''s support from said wing spar whereby weight load and at least some thrust loads of said at least one ducted fan engine are transmitted directly through said first attachment means and through said nacelle to said main wing spar.
Claim 2
Dependent Claim
177 words
In combination with a wing structure having a main spar, an arrangement for mounting above said wing structure at least one ducted fan engine of the type comprising a gas generator core engine having a casing, a station of fan blades forward of said casing, and a cowl surrounding said station of fan blades and defining a portion of a fan duct surrounding said casing, said arrangement comprising: a nacelle extending about said at least one ducted fan engine and spaced from the casing of said gas generator core engine to define a remaining portion of said fan duct; means for supporting said nacelle from an upper surface of said main wing spar; and a first attachment means to fixedly support said ducted fan engine from said nacelle at a position on said nacelle remote from said nacelle''s support from said wing spar whereby weight load and at least some thrust loads of said at least one ducted fan engine are transmitted directly through said first attachment means and through said nacelle to said main wing spar.
Claim 3
Dependent Claim
69 words
The combination as claimed in claim 1 in which said first attachment means includes at least a pair of longitudinally spaced attachment members, a first of said attachment members attaching said cowl to said nacelle and a second of said attachment members attaching said gas generator core engine to said nacelle at a position downstream of said first attachment member and downstream of said gas generator core engine''s mid-point.
Claim 4
Dependent Claim
44 words
The combination as claimed in claim 2 including a second attachment means comprising a thrusT strut connected at one end to the upstream end of said gas generator core engine and at its other end to a lower portion of said main wing spar.
Claim 5
Dependent Claim
61 words
The combination as claimed in claim 1 including a second attachment means connecting a forward portion of said gas generator core engine to said main spar at a location remote from the upper surface of the main spar for absorbing other thrust loads of said at least one ducted fan engine whereby the main spar absorbs all weight and thrust loads.
Claim 6
Dependent Claim
61 words
The combination as claimed in claim 4 in which said second attachment means includes a thrust strut extending in a generally longitudinally direction and connected at one end to the upstream end of said gas generator core engine, said strut extending through said main wing spar and connected at its other end to a lower portion of said main wing spar.
Claim 7
Dependent Claim
76 words
The combination as claimed in claim 1 in which said nacelle includes a main portion which is structurally supported from said main spar, a detachable intake portion connected to the upstream end of said main portion and surrounding and projecting forward of said cowl, and an outlet portion detachably connected to the downstream end of said main portion and surrounding the downstream end of said gas generator core engine, said outlet portion defining a fan nozzle.
Claim 8
Dependent Claim
22 words
The combination as claimed in claim 6 in which said nacelle has an inverted U-shaped cross-section at least in its main portion.
Claim 9
Dependent Claim
22 words
The combination as claimed in claim 6 in which said main portion of said nacelle is integral with said main wing spar.
Claim 10
Dependent Claim
26 words
The combination as claimed in claim 6 in which said main portion of said nacelle is separate from, but rigidly fixed, to said main wing spar.
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |