IBF method

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[Power Drift System]
In propeller aircraft, the propeller wake is applied to the wing with the flaps lowered, bending it downward. In jet aircraft, the turbofan engine is placed in front of the wing, and the exhaust is applied to the flap to bend it downward (EBF, short for externally blown flap), and the exhaust is blown diagonally downward from the trailing edge of the wing (IBF, short for internally blown flap). Among EBFs, the one that blows the exhaust over the top of the wing and bends it downward along the flap is called USB (short for upper surface blowing) (short takeoff and landing aircraft). IBFs are also called jet flaps, and are similar to the blowing flaps mentioned above, but differ in that the amount of air blown is much larger and is blown out beyond the wing to generate thrust. …

*Some of the terminology used in reference to the "IBF method" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

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［パワードリフト･システム］
　プロペラ機では，フラップを下げた翼にプロペラの後流を当てて下へ曲げる方法が利用されている。ジェット機ではターボファンエンジンを翼の前に置き，排気をフラップに当てて下へ曲げるEBF(externally blown flapの略)方式と，排気を翼の後縁から斜め下向きに吹き出すIBF(internally blown flapの略)方式に大別され，EBFのうち，排気を翼の上面に流しフラップに沿って下へ曲げるものはUSB(upper surface blowingの略)と呼ばれる(短距離離着陸機)。IBFはジェットフラップともいい，前述の吹出しフラップに似ているが，吹き出す空気量がずっと大きく，翼より後方まで噴出させて推力とする点が異なる。…

※「IBF 方式」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報