Date: 27 Aug 99 03:08:26 From: JF Mezei <firstname.lastname@example.org> References: 1 2 3
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James Matthew Weber wrote: > Airbus aircraft cannot make FL390 even empty! Boeing learned the > importance of this early one with the 747, and each version of the 747 > has had improved high weight altitude capability. At MGTOW a 747-100 can > reach only 25,000 feet. A 777-200 can go directly to FL390 at MGTOW. >From the boeing web site: Initial cruise altitude: 777-200 39,300 feet (11,975 m) MGW 36,600 feet 777-300 36,400 feet (11,095 m) So, if you are talking about long range aircraft, then the 777's initial cruise altitude is about 36.5k feet. I don't consider the 777-200 (without ER/MGW) to be a long range aircraft. Also, the Boeing web site states that all 747s have an initial cruise altitude of 34.7k feet. (perhaps they refer only to currently produced 747s). As well, the Airbus web site now includes the maximum cruise speed. So while the optimum cruise speed for the 330 and 340s is 0.82 , the maximum is stated at 0.86 Altitude information is not provided by Airbus. And as far as no commercial airline being able to fly over cumulus couds at 60k feet. What about the Concorde ?