TERMIUM Plus®

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WINDMILL OPERATION [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-10-17

English

Subject field(s)
  • Aircraft Propulsion Systems
CONT

The term feathering refers to the operation of rotating the blades of a propeller to an edge-to-the-wind position for the purpose of stopping the rotation of the propeller whose blades are thus feathered and to reduce drag. Therefore, a feathered blade is an approximate in-line-of-flight position, streamlined with the line of flight. Some, but not all, propellers can be feathered. Feathering is necessary when an engine fails or when it is desirable to shut off an engine in flight. The pressure of the air on the face and back of the feathered blade is equal, and the propeller will stop rotating. If it is not feathered when its engine stops driving it, the propeller will "windmill" and cause drag.

OBS

feathering: term officially approved by the International Civil Aviation Organization (ICAO).

Key term(s)
  • feathering operation

French

Domaine(s)
  • Propulsion des aéronefs
CONT

La mise en drapeau est assurée par le moteur de changement de calage lui-même.

OBS

mise en drapeau : terme uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Key term(s)
  • manœuvre de drapeau
  • passage en drapeau

Spanish

Campo(s) temático(s)
  • Sistemas de propulsión de aeronaves
OBS

puesta en bandera : término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 1

Record 2 2015-02-24

English

Subject field(s)
  • Aircraft Propulsion Systems
DEF

A propeller the blades of which have been rotated so that the leading and trailing edges are nearly parallel with the aircraft flight path to stop or minimize drag and engine rotation.

CONT

The term "feathering" refers to the operation of rotating the blades of a propeller to an edge-to-the-wing position for the purpose of stopping the rotation of the propeller whose blades are thus feathered and to reduce drag. Therefore, a feathered blade is in an approximate in-line-of-flight position, streamlined with the line of flight. Some, but not all, propellers can be feathered. Feathering is necessary when an engine fails or when it is desirable to shut off an engine in flight. The pressure of the air on the face and back of the feathered blade is equal, and the propeller will stop rotating. If it is not feathered when its engine stops driving it, the propeller will "windmill" and cause drag. Another advantage of being able to feather a propeller is that a feathered propeller creates less resistance(drag) and disturbance to the flow of air over the wings and tail of the airplane.

OBS

feathered propeller: term and definition standardized by the Glossary for Pilots and Air Traffic Services Personnel Committee; term officially approved by the International Civil Aviation Organization (ICAO).

French

Domaine(s)
  • Propulsion des aéronefs
DEF

Hélice dont les pales ont été tournées de manière à ce que les bords d'attaque et de fuite soient presque parallèles à la trajectoire de vol pour réduire ou éliminer la traînée et la vitesse de rotation du moteur.

CONT

Si l'on fait pivoter les pales au-delà de la position normale de grand pas jusqu'à ce que la corde soit parallèle à la direction du vol, de façon à présenter la résistance minimale, on dit que l'hélice est en drapeau. Cette position des pales est particulièrement utile sur un multimoteur, car elle permet de réduire la traînée de l'hélice d'un moteur en panne. Elle offre aussi un moyen commode d'arrêter une hélice et de l'empêcher de tourner «en moulinet»; cela réduit le risque d'aggraver les dommages d'un moteur ayant subi un bris mécanique.

OBS

hélice en drapeau : terme et définition normalisés par le Comité sur le Glossaire à l'intention des pilotes et du personnel des services de la circulation aérienne; terme uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Spanish

Campo(s) temático(s)
  • Sistemas de propulsión de aeronaves
CONT

[...] si un motor se para en el aire, el piloto orienta las palas de la hélice en su posición de mínima resistencia al aire (hélice bandera).

OBS

hélice en bandera: término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 2

Record 3 2005-07-20

English

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

A rotation anemometer in which the axis of rotation is horizontal.

CONT

[The] windmill anemometer [is] an anemometer in which a windmill is driven by the air stream, and its rotation is transmitted through gearing to dials or other recording mechanism. In some instruments, the rotating vanes and dials are in the same plane; i. e., both vertical, while in others the dial is horizontal. In the windmill type, the operation of air measurement involves readings of dials at the beginning and end of a measured period. Windmill instruments may be fitted with an extension handle, providing a form of remote control; used to measure air speed in an otherwise inaccessible spot.

OBS

The [windmill anemometer] has either flat vanes (as in the air meter) or helicoidal vanes (as in the propeller anemometer). The relation between wind speed and angular rotation is almost linear.

French

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

Instrument de mesure de la vitesse du vent d'après la rotation d'un moulinet à axe horizontal.

CONT

anémomètre à moulinet. Deux types : à pales planes et à hélice, windmill anemometer (flat vanes or air meter; helical vanes or propeller anemometer).

Spanish

Save record 3

Record 4 1996-06-22

English

Subject field(s)
  • Electric Rotary Machines - Types
  • General Scientific and Technical Vocabulary
Key term(s)
  • grid windmill operation
  • coupled windmill operation
  • windmill operation
  • grid coupled windmill

French

Domaine(s)
  • Machines tournantes électriques - types
  • Vocabulaire technique et scientifique général
OBS

Source : MS-336/82.

Key term(s)
  • fonctionnement d'une éolienne
  • éolienne connectée à un réseau de distribution principal

Spanish

Save record 4

Record 5 1985-08-09

English

Subject field(s)
  • Aircraft Propulsion Systems
CONT

A propeller is ’windmilling’ when it is delivering power to the propeller shaft.

CONT

As the blades are unfeathered, they begin to windmill and assist the unfeathering operation by the added force toward low pitch brought about by the centrifugal twisting moment.

Key term(s)
  • wind-mill

French

Domaine(s)
  • Propulsion des aéronefs
CONT

La mise en drapeau est impérative dans le cas d'une panne de moteur, car l'hélice tournant en moulinet le détériorerait complètement. De plus, une hélice fonctionnant en moulinet provoque une traînée aérodynamique importante, et un multimoteur, ayant un de ses propulseurs en panne, a intérêt à réduire au minimum les traînées parasites; il voit ainsi augmenter son altitude de plafond.

Key term(s)
  • fonctionner en aéromoteur

Spanish

Save record 5

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