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[quote][i]Originally posted by Steve[/i] another quote that explains perfectly "The landing gear are merely a way of eliminating (most of the) friction between the airplane and the runway. How fast the wheels are turning is meaningless. For instance, to take an example from real life, say the runway is coated with ice. The wheels will not be turning as fast as they would on a dry runway. In fact, on a perfectly frictionless surface, the wheel would not turn at all! The only thing that matters if how fast the airplane is moving through the air. The thrust generated by the plane moves the plane forward. The conveyor belt moving backwards spins the wheels backwards at twice their normal rate for that speed on a dry runway. So now the plane is moving forward at 100 knots and the wheels are spinning forward at 200 knots and the runway is moving backwards at 100 knots. So the wheels’ relative speed to the ground is 100 knots, the 100 knots generated by the airplane." [/quote]
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