Re: Flying High ?

Date:         13 Mar 98 03:35:10 
From:         jf mezei <"[non-spam]jfmezei">
References:   1 2 3
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James Matthew Weber wrote:
>Your 130 pounds at sea level will
> weight 129.7 pounds at 40,000 feet.  This is simply not a significant
> factor.

But taken on the whole plane filled with people and cargo, doesn't this
change in WEIGHT not allow the plane fly more efficiently ? OK, so it is
just 0.4% (0.004) in change roughly.  But in aerodynamics, isn't any
reduction in drag accompanied by a significant performance increase ?

Since incremental refinements in efficiency of aircraft are getting
smaller and smaller, doesn't this relatively insignificant different not
start to make a difference ?

(Think of it in olypics records which use dto be broken by seconds and
are now being broken by hundreths of seconds which yse to be thought of
as insignificant).

While we're at it, is the "centrifugal force" of the plane circling the
earth at 10km altitude at about 1000kmh in favourable winds as
significant as the weight difference factor or is it really really close
to nil ?