DR GARY SETTLES / SCIENCE PHOTO LIBRARY DR GARY SETTLES / SCIENCE PHOTO LIBRARY
Soviet MIG-21. 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. Photographed in the National Museum of the US Air Force.
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