RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY
Polish Military Museum. Mig 21 fighter jet outside the Muzeum Wojaska Polskiego (Polish Military Museum), Warsaw, Poland. This supersonic fighter aircraft was used in conflicts such as the Vietnam War. It has an adjustable conical spike air intake (green), designed to compress and slow the incoming supersonic airstream efficiently to subsonic speed before entering the aircraft's jet engine.
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