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post #17 of Old 09-12-2009
JimsCAL
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One thing to keep in mind: the power doesn't vary linearly with speed (and RPM), it varies with about the cube! So at 3 knots, you need about 1/8 the power you do at 6 knots. Reduce the speed by only 20% and the power is only about half of what it was. That explains the differences between the calculated fuel consumptiong based on rated engine power and actual consumption at cruise speeds.
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