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From: seifert@ihuxl.UUCP (D.A. Seifert)
Newsgroups: net.auto
Subject: Re: DC-10 at 55 MPH
Message-ID: <1198@ihuxl.UUCP>
Date: Wed, 27-Jun-84 09:10:33 EDT
Article-I.D.: ihuxl.1198
Posted: Wed Jun 27 09:10:33 1984
Date-Received: Thu, 28-Jun-84 05:24:46 EDT
References: <232@lzmi.UUCP>
Organization: AT&T Bell Labs, Naperville, IL
Lines: 21

> > How come your friendly neighborhood DC-10 doesn't have to go 55?
> > I bet it would get better milage at a slower speed too.
> 
> Quite the contrary - at 55, a DC-10 would have to stay on the ground,
> which would be most inefficient.  The faster a jet goes, the higher it
> can fly (within reason), and the higher it flies, the thinner the air. 
> The difference between air density at 0 and at 35,000 feet is
> significant.

And presumably the thinner the air the less air resistance?

Fine, but passenger cars still get better fuel efficiency than
commercial jetliners. (per person)

Maybe 55 is a plot by the airlines to increase their business.
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