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747 Flies Mach .90?  
User currently offlineMirrodie From United States of America, joined Apr 2000, 7444 posts, RR: 62
Posted (13 years 1 month 3 weeks 3 days 1 hour ago) and read 1082 times:
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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.



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5 replies: All unread, jump to last
 
User currently offlineThe747Man From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 1 month 3 weeks 3 days ago) and read 1044 times:

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.

User currently offlineAJ From Australia, joined Nov 1999, 2397 posts, RR: 25
Reply 2, posted (13 years 1 month 3 weeks 3 days ago) and read 1025 times:

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.

User currently offlineMr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 22
Reply 3, posted (13 years 1 month 3 weeks 2 days 22 hours ago) and read 979 times:

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!
User currently offlineRed Panda From Hong Kong, joined Jun 2000, 1521 posts, RR: 0
Reply 4, posted (13 years 1 month 3 weeks 2 days 7 hours ago) and read 925 times:

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


User currently offlineRickB From United Kingdom, joined May 2003, 243 posts, RR: 9
Reply 5, posted (13 years 1 month 3 weeks 2 days 4 hours ago) and read 887 times:

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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