ion from 0.515 to 0.50 to 0.525. This is a 5 per cent variation from the optimum at ground, compared with a 13 per cent variation ( —) at 30,000 feet. The fuel consumption per I. H. P. per hour, for a given speed, remains about constant at around 0.46 up to 10,000 or 15,000 feet; above this it…
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