Keywords
Citation
(2002), "Airplane safe take-off rotation indicator with headwind calculation", Aircraft Engineering and Aerospace Technology, Vol. 74 No. 2. https://doi.org/10.1108/aeat.2002.12774bad.004
Publisher
:Emerald Group Publishing Limited
Copyright © 2002, MCB UP Limited
Airplane safe take-off rotation indicator with headwind calculation
Keywords: Patents, Aircraft
In GB Patent GB2353511 Safe Flight Instrument Corporation describe a device for indicating that an airplane has reached a safe speed in the presence of headwinds for initiating takeoff rotation. The device senses the true ground speed of the airplane and converts the true ground speed into an "indicated ground speed" using a coefficient between true air speed and indicated air speed for the airplane, which may be based on wnbient air temperature and pressure. The device determines a value relating to headwind from the dilterence between the indicated ground speed and the indicated air speed of the airplane 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 takeoff rotation when the indicated air speed of the airplane equals or exceeds the adjusted minimum indicated air speed. The device may utilise summers, clippers and a solenoid or use a computer to process data.