Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Downward air turbulence caused by the motion or action of a propeller or jet: the downwash of the helicopter blades.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. downward air turbulence caused by a propeller or jet, but especially by helicopter blades
  • n. The downward motion of air as a result of eddies behind a wing or chimney. etc.

Etymologies

From down- +‎ wash (Wiktionary)

Examples

  • "There is then potential for a breakthrough in the current Libyan stalemate to create a short-term downwash in oil prices, but we would not expect that move to stick for long," the analysts said.

  • The aircraft's heavy "downwash" of air from the rotors is so strong it has dislodged on-deck equipment.

    Stars and Stripes

  • Corporal Mark Wright, of the 3rd battalion Parachute Regiment, was killed by a landmine set off by the 'downwash' from a Chinook

    Home | Mail Online

  • Coroner Andrew Walker ruled that the blast which killed Corporal Mark Wright, 27, was caused by the 'downwash' from a Chinook which had been sent to rescue a platoon of Paras stranded in an unmarked minefield.

    Home | Mail Online

  • On both days I visited, smoke was blowing toward the base, and a "downwash" effect was causing the smoke to billow across playing fields into base housing and schools. "

    Veterans Today - News for U.S. Military Veterans Jobs, VA Benefits, Home Loans, Hospitals & Administration

  • Shaffer and Sweaney exchanged grins and a thumbs-up as they brought the new Osprey in over a small stand of trees between the river and the parade ground and their rotor downwash only blew a few leaves and branches down.

    The Dream Machine

  • With the downwash from its rotors kicking up clouds of dust, Erhart then lifted the XV-15 into a hover and climbed vertically to about 100 feet, roughly a third as high as the Capitol dome.

    The Dream Machine

  • When a rotorcraft takes off straight up or hovers, it has to produce a pound of thrust for every pound it weighs, plus enough to compensate for whatever portion of its rotor downwash pushes down on the fuselage and other parts of the machine.

    The Dream Machine

  • The deck crews were able to work under the Osprey despite the powerful downwash from its rotors with their high disk loading.

    The Dream Machine

  • A rotor that descends fast enough to start ingesting its own turbulent downwash can stop producing enough thrust to provide lift.

    The Dream Machine

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