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Joined: Wed Apr 19, 2000 3:33 am

747 Flies Mach .90?

Thu Nov 08, 2001 12:10 pm

In refernce to the post "sonic cruiser update," the link mentions on article about it at:

It mentions that the 747 can cruise at mach.85 and sometimes .90. Is that true? I thought the Trijets generally were faster. 727, dc-10, Md-11?

Just wondering. THanks.
Forum moderator 2001-2010; He's a pedantic, pontificating, pretentious bastard, a belligerent old fart, a worthless st
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RE: 747 Flies Mach .90?

Thu Nov 08, 2001 12:23 pm

Yes it's probably true. If the flight has burned some fuel, and has a light load, and cruising at a pretty high altitude, yes. I've seen pics in the database of them going M. 0.86, more than the 0.85.
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RE: 747 Flies Mach .90?

Thu Nov 08, 2001 12:29 pm

The B747-400 can go up to roughly Mach 0.92. Normal cruise for a B747-2/3/400 is around M 0.85, and for an SP M0.86.
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RE: 747 Flies Mach .90?

Thu Nov 08, 2001 2:53 pm

Boeing website stated that the B744 goes at Mach.85... but from my experienace of flights and pictures.. they are all going like Mach.859 or .860?

Boeing747 万岁!
Red Panda
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RE: 747 Flies Mach .90?

Fri Nov 09, 2001 5:39 am

The economic cruising speed for 747-300/400/sp are higher than 747-200. The SUD enable 747 to cruise economically at .85 instead of .84 in 742.

r panda
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Joined: Mon May 19, 2003 3:11 am

RE: 747 Flies Mach .90?

Fri Nov 09, 2001 8:31 am

Can anyone comment on whether or not a 747 flying at Mach .90 burns more fuel per seat per mile than is projected for the SC?

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