Re: 747 fuel consumption question

From:         K.G.A.Lewis@sussex.ac.uk (Ken Lewis)
Organization: University of Sussex
Date:         17 Aug 95 04:58:55 
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Ted Pleavin (pleavin@HK.Super.NET) wrote:
: In article <airliners.1995.1186@ohare.Chicago.COM>,
:    deen@caip.rutgers.edu (Emile Deen) wrote:

: >How much fuel does a 747 (say a 747-400) carry?

: B-747-200/300 with reserve tanks 1,2,3,4 and center wing tanks full
: about 170,026 kg of usable fuel at an sg of 0.78

: >How much does it use to take off?

: At T/O fuel burn is about 20,000 kg/hr total at sea level on an
: average engine set of Rolls Royce RB 211 at max B2 thrust.

It is (perhaps) interesting to note that the three answers for fuel burn
were 9 tonnes, 16 tonnes and 20 tonnes per hour at T/O.  Is the
variation really this large?  Does the rate of fuel burn differ significantly
depending on take-of weight, field altitude and temperature?  Obviously
the total fuel burn depends on weight etc.

Ken Lewis
k.g.a.lewis@sussex.ac.uk