US3914997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static pressure probe
Assignee: National Aeronautics and Space Administration
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Filing: 1974-10-29
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Granted: 1975-10-28
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Expires: 1994-10-29
Abstract
Abstract An improved static pressure probe having a smaller length than conventional static probes with the same diameter and requiring no compensation for yaw angles of up to 10*.
Inventors
- 👤 Shimer Z Pinckney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:50
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/40; G01F1/46
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A static pressure probe for accurately sampling the freestream static pressure of a flowing fluid while reducing the adverse effects of extended probe length and probe yaw angles with respect to the freestream comprising: a conic tip portion having a half angle pointably oriented into the direction from which the fluid to be measured is flowing to cause the flow to part evenly therearound; a tangent conic curved portion connected to said conic tip portion to cause the static pressure along the curve to decrease toward the freestream static pressure; a tangent cone portion connected to said tangent conic curve portion to effectively extend the distance over which the static pressure approaches that of the freestream pressure; a static pressure measuring means to measure surface static pressure located upon said tangent cone portion such that the surface static pressure at the location approaches that of the freestream static pressure; a cylindrical tubular body portion connected to and supporting said tangent cone portion.
Claim 2
Dependent Claim
162 words
A static pressure probe for accurately sampling the freestream static pressure of a flowing fluid while reducing the adverse effects of extended probe length and probe yaw angles with respect to the freestream comprising: a conic tip portion having a half angle pointably oriented into the direction from which the fluid to be measured is flowing to cause the flow to part evenly therearound; a tangent conic curved portion connected to said conic tip portion to cause the static pressure along the curve to decrease toward the freestream static pressure; a tangent cone portion connected to said tangent conic curve portion to effectively extend the distance over which the static pressure approaches that of the freestream pressure; a static pressure measuring means to measure surface static pressure located upon said tangent cone portion such that the surface static pressure at the location approaches that of the freestream static pressure; a cylindrical tubular body portion connected to and supporting said tangent cone portion.
Claim 3
Dependent Claim
44 words
The apparatus of claim 1 in which said static pressure measuring means are located downstream of the junction of said tangent conic curve portion and said tangent cone portion a distance approximately equal to one half the diameter of said cylindrical tube body portion.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1 in which said conic tip portion is comprised of a half angle of approximately 20*.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 in which said tangent cone portion is comprised of a half angle of approximately 3*.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1 in which said conic tip portion is comprised of a pitot tube means to measure stagnation pressure of said flowing fluid.
Claim 7
Dependent Claim
63 words
The apparatus of claim 1 in which said conic tip portion has a half angle approximately 20*, said tangent cone portion has a half angle of approximately 3* and said static pressure measuring means are located downstream of the junction of said tangent conic curve portion and said tangent cone portion approximately one half of the diameter of said cylindrical tube body means.
Claim 8
Dependent Claim
14 words
The apparatus of claim 1 where the flowing fluid is comprised of atmospheric air.
Claim 9
Dependent Claim
23 words
The apparatus of claim 1 where said conic tip portion includes a pitot tube means to indicate stagnation pressure of said flowing fluid.
References Cited (Backward Citations)
US3029639A
Cited
US3400583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |