Relative Wind

The relative wind is a technical term used in the aeronautical or the Aérodynamique.

When a mobile moves in a fluid (air or liquid), it is subjected to a watering on behalf of the molecules of the carrying fluid.

In the jargon of the Blower S of test, one says even besides that its surface is wet by the fluid.

Relative wind in aerial navigation

By null wind, the wind of the race like one says commonly, is thus equal to the rate of travel and its direction is opposed exactly to that of the mobile. When the mobile moves in the presence of a real wind (for example side), one qualifies relative wind the vectorial resultant of the two components of wind, as being the wind perceived by the mobile, in a reference mark “relative” to the mobile. The definition of the “relative wind” in Aerial navigation is thus equivalent to that of the “apparent Vent” in sea Transport.
In Aeronautical, a cross-wind obliges the pilot of an aircraft to modify its course to remain on its Route (navigation) (flight out of crab ) and to thus compensate for its drift.

Relative wind in sea transport

In sea transport, and particularly veils some, the expression apparent Vent defines the wind perceived by a ship on the way (moving) subjected to a real wind, that which it would measure with the stop (with damping, fixed compared to the bottom), and with the wind due at its speed in the mass of air. The expression relative wind is hardly employed. It would correspond then to the wind true speed, or wind speed.

On a Sailing or a Sand yacht, it is the apparent wind, and not the real wind, which is intercepted by the veils: it is all the more strong as the ship goes quickly, and all the more near to the axis of the ship; this allows in certain cases the mobile of going more quickly than the real wind.

This difference in terminology between sea transport and aeronautics is explained by the fact why the ships evolve/move in two mobile mediums, the sea and its currents, and a mass of air which can be also moving.

A plane can drift in the air under the influence from the wind. A sailing ship

  • drift on water under the enfluence of the wind,
  • drift compared to the bottom under the influence of the marine currents,
  • receives an apparent wind produced of a complex combination to obtain the true speed on its true road.

See also: Road (navigation)

See also:

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