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Old 28th Nov 2008, 20:08
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Intruder
 
Join Date: May 2000
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Fuel flow is relatively constant as a function of Indicated Airspeed at a given gross weight. However, 300 KIAS at sea level is more like 500 KTAS at 30,000'.

For a constant TAS, 2% reduction in IAS per 1000' altitude is a quick rule of thumb.
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