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PROPELLER EFFECT [3 records]

Record 1 2020-10-29

English

Subject field(s)
  • River and Sea Navigation
  • Hydrology and Hydrography
CONT

Bank effect refers to the tendency of the stern of a ship to swing toward the near bank when operating in a river or constricted waterway. … This phenomenon depends on many parameters, such as bank shape, water depth, ship-bank distance, ship properties, ship speed and propeller action. A reliable estimation of bank effects is important for determining the limiting conditions in which a ship can safely navigate a waterway.

French

Domaine(s)
  • Navigation fluviale et maritime
  • Hydrologie et hydrographie
CONT

L'effet de bande désigne la tendance de la poupe d'un navire à se diriger vers la rive la plus près lorsque le navire se déplace sur une rivière ou dans une voie navigable restreinte. L'écoulement asymétrique autour du navire induit par la proximité des rives entraîne une différence de pression (principe de Bernoulli) entre le côté bâbord et le côté tribord. Par conséquent, le navire sera soumis à une force latérale principalement dirigée vers la rive la plus près, ainsi qu'à un mouvement de lacet poussant l'étrave vers le centre de la voie navigable.

Spanish

Save record 1

Record 2 2004-11-08

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
DEF

A rotation anemometer which has a horizontal axis upon which helical shaped vanes are mounted.

CONT

Another increasingly popular type of anemometer is the propeller anemometer. This anemometer is simply a very small two-or three-blade propeller, calibrated so that the revolutions per minute(rpm) corresponds to specific wind speeds. This anemometer is known as a "lift" device because it relies upon the rational lift caused by the wind on the propellers to measure the wind speed. By using two propellers held fixed at a perpendicular angle to each other, one can simultaneously measure the wind speed and direction using vector analysis. By including a third propeller positioned vertically relative to the other two, vertical wind movements also can be measured. It should be noted that the effect of variations in air density(due to temperature and/or pressure conditions) are accounted for differently in lift devices(for example, propeller anemometers) and drag devices(for example, cup anemometers).

CONT

The ... propellor anemometer consists of a circular array of blades, usually not less than three, mounted at one end of a horizontal shaft; the blades are free to rotate in response to wind forces acting on them. A wind vane is attached to the opposite end of the shaft. The horizontal shaft is connected to a vertical shaft which, being mounted in bearings, turns as the varying wind direction acts on the vane.

CONT

THEORY OF MEASUREMENTS: Wind speed: Propeller anemometer. Wind direction: Wind vane.

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
DEF

Anémomètre qui possède un axe horizontal sur lequel sont montées des pales plates ou hélicoïdales.

CONT

[...] anémomètres à moulinet et à hélice. La différence essentielle entre ces deux types est que le moulinet est un capteur planaire (il mesure la proportion du vecteur vent sur un plan perpendiculaire à son axe de rotation) alors que l'hélice est un capteur cartésien (elle mesure la projection du vecteur vent sur son axe de rotation).

Spanish

Save record 2

Record 3 1983-12-01

English

Subject field(s)
  • Air Transport
  • Aeroindustry
OBS

--the maximum propeller rotational speed which has been determined to have no detrimental effect on the propeller when used for a stated period of time.

French

Domaine(s)
  • Transport aérien
  • Constructions aéronautiques
OBS

--vitesse maximale de rotation de l'hélice qui a été reconnue susceptible d'être maintenue pendant une période déterminée sans effet nuisible sur la tenue de l'hélice.

Spanish

Save record 3

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