Date: 21 Nov 99 23:56:41 From: "P. Wezeman" <firstname.lastname@example.org> Organization: The University of Iowa References: 1 2
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On 5 Nov 1999, Robert Wright wrote: > I'm not sure, but I did once talk to a captain who said that on very > heavy takeoffs, particularly out of places like Honolulu which involved some > long taxiing, he would leave the gear down longer than normal after takeoff. > This allowed the airflow more time to cool the brakes and also allowed the > airplane to build up more speed before gear retraction. (The first thing > that happens is that the main gears doors OPEN, to allow the gear back in, > increasing drag.) I don't know if this is standard procedure, or just one > captain's style. Why are the brakes hot at take-off? I thought it was the tire sidewalls that overheated. As it seems to me from watching, the plane taxis out using throttle to control speed, then stops from taxi speed and uses brakes to hold during run-up, then releases brakes and moves onto runway, and may stop once on runway before starting take-off run. Brakes are used twice or so at taxi speed, a fraction of their capacity. Is this incorrect? Do pilots have to"ride" the brakes to control taxi speed? Peter Wezeman, anti-social Darwinist "Carpe Cyprinidae"