Date: 15 Nov 96 12:25:38 From: firstname.lastname@example.org (Peter Coe) Organization: BEST Internet Communications References: 1 Followups: 1
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Rich Webb <email@example.com> writes: >What is the top speed of Concorde, AND more importantly, can it maintain >this speed (or any supersonic speed) without the aid of afterburners? Concorde's cruising speed is 1,336mph. It does this without afterburners. >From experience, the plane starts the take-off run without reheat, but then lights up shortly into the roll. Within about 30 seconds of take-off, the afterburners are killed. I presume this is for no other reason than noise abatement. When the plane has reached significant altitude, and is ready for supersonic cruise, the afterburners are lit up again, and to accelerate through Mach 1, and upto near cruising speed. The afterburners are switched off short of cruising speed, and normal engine thrust is used for the last bit of acceleration. The total time on afterburner is quite short, a minute and a half on take-off, and maybe 10 minutes to break the sound barrier. Concorde is the only plane that cruises at beyond Mach 2 without reheat. Yet another 30 year old invention that hasn't been bettered. On a supplemental thread, I vaguely recall that at the time of its entry into service, Concorde's engines were claimed to be the most effecient engine ever built - I presume in terms of thrust per pound of fuel. The plane isn't effecient overall, because it operates in such an ineffecient environment.