High-lift device

Japanese: 高揚力装置 - こうようりょくそうち(英語表記)high-lift device
High-lift device
A device installed on an airplane's wing to increase the lift coefficient so as to reduce the speed during takeoff and landing (→ lift). Reducing the speed of an airplane is important for improving flight safety and shortening runway length, but this requires the use of a wing with a large area relative to its weight. However, as the wing area increases, the high-speed performance deteriorates and the economy of the aircraft as a transport decreases. Therefore, a high-lift device must be devised for a small wing. Trailing edge flaps, which are movable trailing edges of the wing that are pulled backward at low speeds and bent downward at the same time, are the most common and are installed in almost all aircraft (→ flaps). A leading edge slat is a movable leading edge that extends diagonally forward and downward, and a leading edge droop is a simple fold of the leading edge that is simply bent downward. They are installed on many high-performance aircraft and large passenger jets. Some high-lift devices also use the power of a power source to increase lift at low speeds, such as blown flaps, which draw high-pressure air from a propulsion turbine engine and blow it out over the top of a trailing edge flap.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
飛行機の主翼に装備して,離着陸時の速度を低減するように揚力係数を増大させる装置 (→揚力 ) 。飛行機の速度を低減することは,飛行の安全を高め,滑走路長を短くするために大切であるが,そのためには重量の割合に面積の大きい主翼を採用する必要がある。しかし主翼面積が大きくなると,高速性能が悪くなり,輸送機としての経済性も低くなる。そこで面積の小さい主翼に対しては高揚力装置を工夫する必要がある。主翼の後縁部分を可動式とし,低速時にこれを後方に引き出し,同時に下方に折り曲げる後縁フラップ trailingedge flapは最も一般的なもので,ほとんど例外なく装備されている (→フラップ ) 。主翼前縁部を可動式とし,斜め前下方にせり出す方式を前縁スラット leadingedge slat,前縁部を単に下方へ折り曲げるのを前縁ドループ leadingedge droopといい,高性能機や大型ジェット旅客機の多くに装備されている。また高揚力装置のなかには,推進用タービンエンジンから高圧空気を取り出して後縁フラップの上面から吹き出す,吹き出しフラップ blown flapなど,動力源のパワーを使って低速時の揚力を増すものもある。

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