Airplane safe take-off rotation indicator

Details Airplane safe take-off rotation indicator Airplane safe take-off rotation indicator

1993-11-01

1999-11-09

Swarthout, Brent A.

Communications: electrical

Aircraft alarm or indicating systems

Takeoff indicator

73178T, 340963, 340969, 701 15, G08B 2100

Patent

active

059823003

ABSTRACT:
A device for indicating that an airplane has reached a safe speed in the presence of headwinds for initiating take-off rotation. The device senses the true ground speed of the airplane and converts the true ground speed into an "indicated ground speed" in accord with the relationship between true air speed and indicated air speed for the airplane. The device subtracts the indicated ground speed from the indicated air speed of the airplane to determine the amount of the headwind and, whenever the headwind exceeds a preselected margin, the device increases the value of the safe minimum indicated air speed for initiation of take-off by any excess of the headwind over the preselected margin. The device then directs the flight director to initiate take-off rotation when the indicated air speed of the airplane equals or exceeds the adjusted minimum indicated air speed.

REFERENCES:
patent: 4106731 (1978-08-01), Bliss
patent: 4133503 (1979-01-01), Bliss
patent: 4530060 (1985-07-01), Greene
patent: 4594592 (1986-06-01), Greene
patent: 4638437 (1987-01-01), Cleary et al.
Introduction to Flight, John D. Anderson, Jr., pp. 99-100, .COPYRGT.1978.

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