Downwash

Downwash
Downwash
HH-60.jpg
The effect of downwash from a hovering helicopter is clearly visible on the surface of water below.

In aeronautics downwash is the air forced down by the aerodynamic action of a wing or helicopter rotor blade in motion, as part of the process of producing lift.[1]

An aircraft produces aerodynamic lift by deflecting air downwards as downwash. This generates an equal and opposite upwards force on the wing called lift. When the downwash force exceeds the weight of the aircraft, the aircraft will rise.[1][2][3]

See also

References

  1. ^ a b Crane, Dale: Dictionary of Aeronautical Terms, third edition, page 172. Aviation Supplies & Academics, 1997. ISBN 1-56027-287-2
  2. ^ Anderson, John D. (2004), Introduction to Flight (5th ed.), McGraw-Hill, pp. 352–361, §5.19, ISBN 0-07-282569-3 
  3. ^ "The main fact of all heaver-than-air flight is this: the wing keeps the airplane up by pushing the air down." In: Langewiesche, Wolfgang (1990), Stick and Rudder: An Explanation of the Art of Flying, McGraw-Hill, pp. 6–10, ISBN 0070362408 

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Look at other dictionaries:

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  • downwash — noun Date: 1915 an airstream directed downward (as by an airfoil) …   New Collegiate Dictionary

  • downwash — /down wosh , wawsh /, n. Aeron. a deflection of air downward relative to an airfoil that causes the deflection. [1910 15; DOWN1 + WASH] * * * …   Universalium

  • downwash — noun a) downward air turbulence caused by a propeller or jet, but especially by helicopter blades b) The downward motion of air as a result of eddies behind a wing or chimney etc …   Wiktionary

  • downwash — i. Fluid flow moving at a deflected angle after deflection by helicopter rotors and measured parallel to the disc. ii. Fluid flow deflected at an angle more perpendicular to the motion of the airfoil, measured in the plane parallel to the plane… …   Aviation dictionary

  • downwash — noun the downward deflection of an airstream by a wing or rotor blade …   English new terms dictionary

  • downwash — /ˈdaʊnwɒʃ/ (say downwosh) noun the air deflected downwards by an aerofoil …  

  • downwash — ˈ ̷ ̷ˌ ̷ ̷ noun 1. : material washed downward (as from a mountainside) 2. aeronautics : the airstream which is deflected downward by an airfoil and the momentum of which gives rise by its reaction on the airfoil to the lift …   Useful english dictionary

  • downwash angle — The angle formed between the direction of air movement as it approaches an airfoil and as it leaves it …   Aviation dictionary

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