mirrodie
Posts: 6789
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:

http://seattlepi.nwsource.com/business/45314_sonic05.shtml
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
 
The747Man
Posts: 361
Joined: Thu Sep 06, 2001 7:14 am

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.
 
AJ
Posts: 2295
Joined: Wed Nov 03, 1999 3:54 pm

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.
 
Mr.BA
Posts: 3310
Joined: Sun Sep 24, 2000 12:26 pm

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?

alvin
Boeing747 万岁!
 
Red Panda
Posts: 1433
Joined: Wed Jun 14, 2000 12:58 pm

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
 
RickB
Posts: 807
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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