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Jet engine intakes

  1. May 4, 2005 #1
    I half remember that jet engine intakes were circular a few years ago. Now they have a squashed appearance with the bottom part quite flat.

    This isn't new as the first German jet at the end of World War II had the same shape but it seems relatively new on airline jet engines.

    So, why are they this shape?
  2. jcsd
  3. May 4, 2005 #2


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    Runway clearance.

    http://www.century-of-flight.freeol... of technology/Noise Reduction Technology.htm

    As an aside, when they were testing the Rolls Royce Trent 900 engines for use on the new Airbus A380, the test plane had such little ground clearance beneath the engines that they allegedly put extra air in the tyres to get another couple of inches clearance.
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