IF you have ever peered out of the windows of the passenger section of a civil aircraft you will know that they are too small and usually in the wrong place. The Eiffel Tower is only visible from the other side of the compartment, the wing blocks the view and the window is misted over. The front of the aircraft is a completely different proposition, particularly if the aircraft is military with a speed of up to Mach 2.5 and a ceiling of 20,000 metres. Here the window, or “transparency” to give it the correct name, is an integral part of the structure.
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