US3880002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary angle of attack indicator
Assignee: Individual
•
Filing: 1973-08-28
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Granted: 1975-04-29
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Expires: 1993-08-28
Abstract
Abstract An angle of attack indicator for use as a cockpit instrument including movable elements which respond to the differences in pressure at various points on the leading edge of the aircraft wing. The operation of the indicator is based on the principles that (1) as the angle of attack of the wing is increased, the point of maximum pressure on the wing moves down around the leading edge thereof, and (2) in the region of the point of maximum pressure, the pressure decreases as one moves away from the point of maximum pressure.
Inventors
- 👤 Roger W Gallington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:39
CPC Classifications
B; B64; B64D; B64D43/00; B64D43/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
A rotary angle of attack indicator for use in an aircraft cockpit instrument comprising, a case, a divider for separating the interior of said case into at least two chambers, a rotatable member disposed in said case including a rotor having two rotor ports on the outer periphery thereof, and an internal air passage leading from each of said rotor ports to separate chambers in said case, a plurality of pressure sources located on the leading edge of the aircraft wing, and means for transmitting the pressures from the aircraft wing to the chambers in said case including a series of tubes positioned along one side of said case and passing therethrough to communicate with said rotor ports and pressurize said chambers, such that variations in pressures produce a corresponding rotation of the rotatable member which is proportional to the angle of attack of the aircraft.
Claim 2
Dependent Claim
146 words
A rotary angle of attack indicator for use in an aircraft cockpit instrument comprising, a case, a divider for separating the interior of said case into at least two chambers, a rotatable member disposed in said case including a rotor having two rotor ports on the outer periphery thereof, and an internal air passage leading from each of said rotor ports to separate chambers in said case, a plurality of pressure sources located on the leading edge of the aircraft wing, and means for transmitting the pressures from the aircraft wing to the chambers in said case including a series of tubes positioned along one side of said case and passing therethrough to communicate with said rotor ports and pressurize said chambers, such that variations in pressures produce a corresponding rotation of the rotatable member which is proportional to the angle of attack of the aircraft.
Claim 3
Dependent Claim
67 words
The rotary angle of attack indicator defined in claim 1 wherein the rotor ports on the outer periphery of the rotor are located one adjacent over the other, said series of tubes being arranged in a double row on the side of the case, each of said rotor ports operatively communicating with a preselected tube so that pressure variations therein effectively produce corresponding rotation of the rotor.
Claim 4
Dependent Claim
41 words
The rotary angle of attack indicator defined in claim 1 wherein one of said rotor ports is partially closed to provide a throttling action for producing a smoother response to pressure variations being transmitted from the leading edge of the wing.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |