Topic Author
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Mach Speeds For Airbus @ Boeing

Mon Oct 09, 2000 4:14 pm

does someone know what are the mach number and crusing altitude for the following aircraft A319 to A340, Boeing 717 to 777 and finally MD80's to MD11.

Ex LAX, LGB, SNA aviation photographer

RE: Mach Speeds For Airbus @ Boeing

Mon Oct 09, 2000 7:39 pm

717: M0.77 (At 34,200ft)
737(-700): M0.78 (At 35,000ft)
747(-400): M0.85 (At 35,000ft)
757: 0.80
767(-300): M0.80 (At 35,000ft)
777(-200): M0.84 (At 35,000ft)

A319: M0.82
A320: M0.82
A321: M0.82
A330(-200): M0.86
A340(-200): M0.86

Nicolas Bourbillon
Montreal, Canada

RE: Mach Speeds For Airbus @ Boeing

Mon Oct 09, 2000 11:01 pm


It looks like you posted close to LRC speeds for the Boeings and max speeds for the Airbus fleet.

I can tell you the 747-400 is faster than .85 mach. I can also tell you the 767-300 is capable of .84 mach as I flew it around all the time at that sped.

The A300-600 max speeds are 335/.82 mach so I suspect the A319/320's max speeds are around .82 as you stated.
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Joined: Wed Aug 30, 2000 8:10 pm

RE: Mach Speeds For Airbus @ Boeing

Mon Oct 09, 2000 11:48 pm

I jump seat home and to work often with Northwest and usually ride on the 757 and A320/A319. The 757 always seems to be at .80-.82, depending on whether they're running late or not. The Airbuses are always at .78.
Occasionally I have been on Fed Exs A300 and A310, they seem to be between .78-.80 all the time.
I have never been on a 717, but the Dc-9 cruises at .75and the MD80 between .76-.78.
As for the rest I'm not sure, one thing to remember is that an airline has the last say in cruise speed. The Mmo is the limiting factor, but most airlines, especially with the newere computer controlled aircraft, set the speed that is the best for economy, so who knows, what one airline uses can be diffrent for another.
Hope this helps


RE: Mach Speeds For Airbus @ Boeing

Tue Oct 10, 2000 1:15 am

LRC for the 777 is M.84

But the 777 can go as fast as .92 in level flight, and Boeing test pilots took it to .98 in a shallow dive once. Boeing designed the 777 to cruise faster than the A340.

The 747 can go as fast as .92 in level flight as well, and I believe it cruises at .88. Correct me if I'm wrong.

At Air Canada, our A319s and 320s cruise at .78, our 330s and 340s cruise at .82.

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Joined: Tue Aug 08, 2000 10:34 am

RE: Mach Speeds For Airbus @ Boeing

Tue Oct 10, 2000 7:26 am

Cruise speed and top speed are different. Some 747s, I understand, are capable of a thirsty .91 mach level flight with a moderate load. Further, I recall that their wings are swept back more than airbusses and other Boeings. The only commercial aircraft made in the USA with an equal wing sweep, I recall, are the Convair 990 and 880 at approximately 39 degrees.

The Boeing 720 was basically designed to be able to maintain .90 mach on the level. Their sweep was 35 degrees, the aircraft were light (lighter than the 990) and the thrust capability was high proportionately.

Qantas operated a pretty hot 707 that was light but fast. Others need to tell the qualifying specs here. I have them, but I think others enjoy posting them more than I do.


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RE: Mach Speeds For Airbus @ Boeing

Thu Oct 12, 2000 3:36 pm

35,000 feet:

MD-80 is .76

B737-200 is .725, while the 300-500 is .745
737NG is .785

RE: Mach Speeds For Airbus @ Boeing

Sat Oct 14, 2000 2:36 am

Wow, the 777-200 can actually go at 0.92 ????????? Now that's really fast.

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Joined: Sun Jul 16, 2000 3:44 am

RE: Mach Speeds For Airbus @ Boeing

Mon Oct 16, 2000 5:37 am

I was in a United 744 that was doing .87 at FL370.
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RE: Mach Speeds For Airbus @ Boeing

Mon Oct 16, 2000 7:21 am

Between ATL-MCO, we were doing Mach .90 in a 777. We were in Orlando in around 35 minutes.
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Joined: Thu Jan 13, 2000 3:58 pm

RE: Mach Speeds For Airbus @ Boeing

Fri Oct 20, 2000 5:11 pm

Ok, just to clear some of this up.


A319/320/321. Max M0.82. Econ: M0.78 (up to M0.79)
A330/340. Max M0.86. Econ: M0.82 (actually, it really is M0.805 from what I have been told).


747. Max M0.92. Econ M0.84-0.86 (depending on weight, some carriers will fly it on a standard M0.84 or an LRC schedule. Also dependent on cost index). Eg, heavy 744, init crz at FL310 at M0.86. Towards end of the flight, FL390, M0.84.



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