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<... How do the Mass Air requirements change with altitude ...>
They don't, except as the heat rejection requirements change.
You get the same mass airflow at 180 kias at sea level or 15 k ft. Of course
your TRUE airspeed at 15k is a lot higher and that's what pumps more of the
thinner air through the system. Also, to the extent that fuel flow is less at
15 k ft, so you have less heat rejection requirements and therefore less mass
flow requirements.
<... if the fuel burn was 8.5gph and altitude was 25K ...>
.... you'd be making about 300 kts TAS and would no doubt have the same mass
airflow as at SL 8.5 gph.
Mass airflow is a function of indicated airspeed which is dynamic pressure which
is how many molecules are going past a point in a unit of time.
Just a theory ... Jim S.
Eric Ruttan wrote:
Ed
How do the Mass Air requirments change with altitude. For example, if the
fuel burn was 8.5gph and altitude was 25K would the mass air requirements
change do to thiner air? Would the lower temp make a difference?
Thanks for your help.
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