Auxiliary rocket - Hojo rocket

Japanese: 補助ロケット - ほじょロケット
Auxiliary rocket - Hojo rocket
In rocket vehicles, this is a general term for rockets other than the main rocket engine. However, boosters are sometimes not included. The most common auxiliary rockets and their roles are explained below. (1) Control rockets A rocket intended to generate attitude control forces for the rocket or to fine-tune the flight speed. Liquid monopropellant rockets are often used, but bipropellants, solid rockets, and in some cases room temperature gas jets are also used. (2) Ullage motor A rocket intended to apply a small acceleration in the axial direction of the vehicle in order to keep the liquid level in the tank at a normal state when starting the engine from a weightless state in a liquid rocket.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ロケット飛翔(ひしよう)体において,主ロケットエンジン以外のロケットの総称である。ただしブースターはこれに含めないこともある。代表的な補助ロケットとその役割を以下に解説する。(1)制御用ロケット ロケットの姿勢制御力の発生,あるいは飛行速度の微調整を目的とするロケット。液体のモノプロペラントロケットを用いる例が多いが,バイプロペラントや固体ロケット,場合によっては常温ガスジェットも用いられる。(2)アレッジモーター 液体ロケットにおいて,エンジンを無重力状態から起動するとき,タンク内液面を正規状態に保持するため,微小な加速度を機軸方向に加えることを目的としたロケット。

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

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