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1

Update As @Zeus has pointed out correctly: Drag coefficient stay constant in my scenario, not drag -- I've updated the explanation accordingly. Sorry for that blunder. The conclusion does not change: Engines with constant PSFC only have an advantage when flying slowly and get worse much quicker than engines with constant TSFC -- but actual engines are mostly ...

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The simple (and probably unsatisfying) answer would be: The maximum headwind into which a helicopter can land will be somewhat less than it’s listed maximum operating speed. Flying at Vmo into a headwind of equal speed should lead to a stationary velocity relative to the ground. In theory, the aircraft could gently lower itself all the way the ground like ...

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The relevant section (3.2.3) of CAP 698 explains how to calculate this as follows: Distance to Reach given height. To calculate the ground distance travelled in order to attain a given height above reference zero: a) Convert the IAS 100 kt to a TAS, assume no position error. b) Apply the wind component to the TAS to obtain the ground speed. c) Determine the ...

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