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Feb28-12, 07:49 AM
P: 409
If you have the following data:

W: window width,
h: the distance from the viewer to the window,
β: the angle between the flight direction and the window ( positive angle when it is getting away from and negative when its coming toward the window)

t: the measured time
L: the distance from the viewer to the plane when it first appears in the window frame,

then for the speed v, you would come up with the following expression:


It can be seen that for some large angles, v becomes infinite. This is because the plane doesn't disappear from the one sides of the window.