Barnhart wrote:

Going thru maps tonite.  Turbonetics have maps online now.

A 20bt at 300hp will fuel burn approximately 20 gallons/hour. This would be 20 x 6 = 120 lbs
fuel/hour and 1440 lbs of air/hour. Total 1560 lbs mass air flow/hour.  26lbs/min.

At 200hp fuel burn is about 10 gallons/hr.  780 lbs/hr mass air flow or 13 lbs/min mass airflow.

Pressure ratio is 14.3 (ambient pressure) + 10 (lbs boost) divided by 14.3 =  1.69  at 1000 ft.

How is the ambient pressure determined for higher altitudes?

Barny
MGDQ

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