System for indicating fuel-efficient aircraft altitude

Details System for indicating fuel-efficient aircraft altitude System for indicating fuel-efficient aircraft altitude

1982-08-26

1984-10-02

Woodiel, Donald O.

Measuring and testing

Navigation

Take-off and landing monitors

G01C 2100

Patent

active

044740620

ABSTRACT:
A 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.

REFERENCES:
patent: 3722272 (1973-03-01), McPherson
patent: 4346595 (1982-08-01), Frosch et al.

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