Quote:
Originally posted by BlueSky:
Do YOU understand that those two things are irrelevant if the plane is stationary on the ground and has not achieved flight?
No, I do not, because airspeed and groundspeed are relevant at all times. A moving car has both airspeed and groundspeed, do you agree? (If you don't think a car has airspeed, stick your hand out the window. But cars don't care about airspeed, since it's the motion over the ground that we care about). Additionally, a STATIONARY car can have airspeed without groundspeed on a windy day. Again, stick your hand out the window. Feel the air moving past the car? That's airspeed. Notice the ground isn't moving, but the air is!

The same things apply to aircraft, whether in the air or on the ground. Do you agree?
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