View Single Post
 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: v=$\frac{4hWL}{t\sqrt{W^{2}+4h^{2}}}$$\frac{1}{4hcosβ-Wsinβ}$ 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.