出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/04/29 07:48 UTC 版)
In astronautics, the Oberth effect is where the use of a rocket engine when travelling at high speed generates much more useful energy than one at low speed. Oberth effect occurs because the propellant has more usable energy (due to its kinetic energy on top of its chemical potential energy) and it turns out that the vehicle is able to employ this kinetic energy to generate more mechanical power. It is named after Hermann Oberth, the Hungarian-born, German physicist and a founder of modern rocketry, who apparently first described the effect.