Structural efficiency

Japanese: 構造効率 - こうぞうこうりつ(英語表記)structural efficiency
Structural efficiency
A type of index that expresses rocket performance. In a single-stage rocket , if its total mass mO is expressed as the sum of the amount of payload mL , the mass of propellant mP , and the structural mass mS (the mass of the rocket engine, tank, head and body structures, tail , etc., the so-called basic rocket structure), then β, generally defined as β = mS / ( mS + mP ) , is called the structural efficiency. In general, the smaller this value , the better the rocket's performance. In a multi-stage rocket, it is defined for each stage, but in this case the upper stage is considered to be the payload.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
ロケットの性能を表す指標の一種。1段式ロケットにおいてその全質量mOが搭載物質量mL,推進剤質量mP,構造質量(ロケットエンジン,タンク,頭部や胴部構造,尾翼などいわゆるロケットの基本的な構造の質量)mSの和で表されるとしたとき,一般にβ=mS/(mSmP)で定義されるβを構造効率という。一般にこの値が小さいほどロケットの性能はよいといえる。多段式ロケットでは各段ごとに定義されるが,この場合上段は搭載物とみなされる。

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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