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In aerospace engineering, the propellant mass fraction is the portion of a vehicle's mass which does not reach the destination, usually used as a measure of the vehicle's performance. In other words, the propellant mass fraction is the ratio between the propellant mass and the initial mass of the vehicle. In a spacecraft, the destination is usually an orbit, while for aircraft it is their landing location. A higher mass fraction represents less weight in a design. Another related measure is the payload fraction, which is the fraction of initial weight that is payload. ==Formulation== The propellant mass fraction is given by: : And because, : it follows that: : Where: : is the propellant mass fraction : is the propellant mass : is the initial mass of the vehicle : is the final mass of the vehicle 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「propellant mass fraction」の詳細全文を読む スポンサード リンク
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