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Very good points Jon. For landing I seem to remember that flaps are brought out to reduce stall speed so they can land at a slower speed, and once they touch down they use reverse thrust and the flaps together to slow down. Don't some of them have braking flaps that open up in the top of the wings as well? Also at some point they use wheel brakes as well. I'm not sure as to when. I've seen a fair number of large jets land, and as you see the wheel touch the tarmac, they screech and produce smoke. I won't think they have the wheel brakes on at that point, but that the screech is produced from the none spinning wheels being forced to spin to quickly. I've always thought there should be some sort of hydraulic or electric motor system to pre spin the wheels, so they would land with out the screech and thus make the tires last longer. Regards, Brent Hartwig From: jonw@psubs.org To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Stopping Flaps, deep flight Date: Thu, 28 Aug 2008 16:11:47 -0400 Just a slight
correction. Flaps on planes are used to increase lift and reduce stall
speed. While lowered flaps do increase drag and therefore would slow down
a plane without any additional increase in power, they are not intended to be
used for slowing down. You'll note that when a plane takes off, flaps
are lowered even though the plane is trying to gain speed.
Jon
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