PPRuNe Forums - View Single Post - Definition of ground speed

22nd Jun 2010, 16:21

#27 (permalink)

Tim Zukas

Join Date: Mar 2000

Location: Oakland CA USA

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"Ground speed. The speed of an aircraft relative to the surface of the earth."

An aircraft that's diving vertically at 500 knots clearly has a speed of 500 knots "relative to the surface of the earth". Is its ground speed 500 knots?

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