from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. upward air turbulence caused by a propeller or jet
  • n. The upward motion of air as a result of eddies behind a wing or chimney, etc.


from Wiktionary, Creative Commons Attribution/Share-Alike License

From up- +‎ wash


  • Wieselsberger showed that when a bird flaps its wings it creates a current known as upwash; essentially, air lifts up and rises round the tips of the wings as they flap.

    The Guardian World News

  • This is due to an aerodynamic phenomenon known as upwash that causes the air flowing over a bird's wings to curl upwards as it passes the wingtips.

    Popular Science - New Technology, Science News, The Future Now

  • Forward recirculation carries upwash into which the wing flies.

    Archive 2009-05-01

  • Energy is recovered from leading edge upwash as circulation rounds the leading edge to produce centrifugal pressure reduction, known as "leading edge suction," and forward thrust.

    Archive 2009-05-01

  • Ignoring upwash, they say about how much air needs to be diverted: Diverting so much air down is a strong argument against lift being just a surface effect that is only a small amount of air around the wing accounts for the lift, as implied by the popular explanation.

    Unthreaded #21 « Climate Audit

  • The raft sucked toward the wet glow and was jerked downwards behind it, the reflected upwash spinning the raft and ejecting it onward.

    Genellan- Planetfall

  • Then suddenly he saw Jack running across the sand in a bathing suit, and entering the shallow rim of a long, swift upwash.


  • The Skimmer flexed in air and hung for an instant, rolling, before it fell with a smack and was gone in an upwash of bright foam.

    Across The Sea Of Suns

  • Other birds flying in the upwash experience reduced drag, and spend less energy propelling themselves.

    The Economist: Correspondent's diary

  • The air flowing over a bird's wings curls upwards behind the wingtips, a phenomenon known as upwash.

    The Economist: Correspondent's diary


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