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System for indicating fuel-efficient aircraft altitudeA method and apparatus are provided for indicating the altitude at which an aircraft should fly so the W/d ratio (weight of the aircraft divided by the density of air) more closely approaches the optimum W/d for the aircraft. A passive microwave radiometer on the aircraft is directed at different angles with respect to the horizon to determine the air temperature, and therefore the density of the air, at different altitudes. The weight of the aircraft is known. The altitude of the aircraft is changed to fly the aircraft at an altitude at which is W/d ratio more closely approaches the optimum W/d ratio for that aircraft.
Document ID
19840026372
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Gary, B. L. (JPL California Inst. of Tech., Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
October 2, 1984
Subject Category
Aircraft Instrumentation
Report/Patent Number
Patent Application Number: US-PATENT-APPL-SN-224231
Patent Number: US-PATENT-4,474,062
Patent Number: US-PATENT-4,346,595
Patent Number: NASA-CASE-NPO-15351-2
Patent Application Number: US-PATENT-APPL-SN-412039
Accession Number
84N34443
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,474,062|US-PATENT-4,346,595|NASA-CASE-NPO-15351-2
Patent Application
US-PATENT-APPL-SN-224231|US-PATENT-APPL-SN-412039

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