12-20-2007, 05:34 PM
HAULN-SS Wrote:Also - do explain how an airplane flying in a horizontal plain could have zero ground speed. If I dropped a plumb bob from the airplane all the way to the ground, the plumb bob would be moving across the earth at all times in an airplane. If this was not the case, we would never have needed to develop helicopters.
if a plane is flying at 100MPH and the wind starts to blow 100MPH in the other direction, then the airspeed indicator would still show 100MPH. But the plane isn't actually going anywhere. No ground speed. As in, a plumb bob descended from the plane would not move.
The only thing that stops a bad guy with a van is a good guy with a van