Re: 42,000 feet

Date:         09 Apr 97 03:09:28 
From:         "Mark E. Ingram" <>
References:   1
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On 30 Mar 1997, BHunnewell wrote:

> I've always been told that the big advantage to flying higher in jets
> is that the engines get more efficient as it gets colder. Above the
> tropopause-the air continues to get thinner but the temp remains
> constant, so, there is no real increased efficiency to flying above the
> tropopause.

I think you are correct as to efficiency, but there are times that I have
climbed to FL 450 (45,000') to top weather.  An aircraft's capability to
go there - and above - can *really* be handy in such situations.


Mark E. Ingram

MarkT@Mo-Net.Com (also