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exhaust velocity

exhaust velocity MIL

exhaust velocity ARCHIT

exhaust velocity ARCHIT

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The efficiency comes from the high exhaust velocity, which in turn demands high energy, and the performance is ultimately limited by the available spacecraft power. en.wikipedia.org

However, for reaching orbital speed, hydrogen is a better fuel, since the high exhaust velocity and hence lower propellant mass reduces the take off weight. en.wikipedia.org

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