US3752422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet augmented ram air scoop
Assignee: Boeing Co
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Filing: 1971-06-30
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Granted: 1973-08-14
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Expires: 1991-06-30
Abstract
Abstract Ram air scoop system, particularly adapted for use in aircraft, wherein cabin air from the interior of the aircraft is fed as a high velocity jet into the scoop and passed through a heat exchanger for the cabin air-conditioning system. This has the effect of improving the aerodynamic efficiency of the scoop by increasing the velocity at the exit of the ram air system in flight, resulting in less drag. While the aircraft is on the ground and air is forced through the scoop by a fan or the like, the cabin air can be at a temperature lower than that of the ambient air, this cooler cabin air acting to increase the efficiency of the heat exchanger.
Inventors
- 👤 J Runnels
- 👤 S Strandbygaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:19
CPC Classifications
B; B64; B64D; B64D13/00; Y; Y02; Y02T; Y02T50/00; Y02T50/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A ram air scoop system for an aircraft having a pressurized cabin comprising a ram air duct having an inlet opening through which ram air enters the duct and an exit nozzle through which ram air leaves the duct, heat exchanger means disposed within the duct, conduit means connecting the interior of the pressurized cabin with the duct and nozzle means opening into the duct connected with the conduit means for injecting cabin air into the duct to thereby improve aerodynamic efficiency of the ram air scoop system and reduce the drag on said aircraft due to said ram air scoop system.
Claim 2
Dependent Claim
102 words
A ram air scoop system for an aircraft having a pressurized cabin comprising a ram air duct having an inlet opening through which ram air enters the duct and an exit nozzle through which ram air leaves the duct, heat exchanger means disposed within the duct, conduit means connecting the interior of the pressurized cabin with the duct and nozzle means opening into the duct connected with the conduit means for injecting cabin air into the duct to thereby improve aerodynamic efficiency of the ram air scoop system and reduce the drag on said aircraft due to said ram air scoop system.
Claim 3
Dependent Claim
31 words
The system of claim 1 wherein said nozzle means is disposed within said duct to create an air jet adjacent a wall of the duct, thereby improving its boundary layer conditions.
Claim 4
Dependent Claim
35 words
The system of claim 1 including a plenum chamber interposed between said nozzle means and the conduit means connecting the interior of said pressurized cabin, with the duct, and valve means in said conduit means.
Claim 5
Dependent Claim
18 words
The system of claim 1 wherein said nozzle means is disposed essentially centrally within said ram air duct.
Claim 6
Dependent Claim
123 words
The ram air scoop system of claim 1 including in an inner wall of the scoop at its inlet opening three movable wall portions two of which are outer portions and the third of which is a center portion intermediate the outer portions and means hinging each outer portion to its adjacent end of the center portion, the end of one outer portion opposite the center portion being adapted to slide along the inner surface of the aircraft skin and the end of the other outer portion being slidable along the underface of the top of the ram air duct so that movement of the center panel toward or away from the aircraft skin varies the inlet area of the ram air scoop.
Claim 7
Dependent Claim
42 words
The ram air scoop system of claim 5 in which the nozzle means are positioned adjacent to the hinging means between the center moveable wall portion and the outer portion sliding on the underface of the top of the ram air duct.
Claim 8
Dependent Claim
53 words
The ram air scoop system of claim 5 including a plenum chamber connected between the conduit means and the nozzle means, the plenum chamber being positioned adjacent to the hinging means between the center moveable wall portion and the outer portion sliding on the underface of the top of the ram air duct.
References Cited (Backward Citations)
US2327737A
Cited
US2721715A
Cited
US2898745A
Cited
US2869535A
Cited
US3097504A
Cited
US3265331A
Cited
US3446223A
Cited
US3630138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |