Bravura
发表于 2025-3-28 16:30:40
Rocket Staging,. .), which is at the limit of feasibility for today’s chemical propulsions. If a higher payload ratio beyond 3% is required, or the S/C needs to leave the gravitational field of the Earth requiring a higher propulsion demand, one has to take measures to increase the rocket efficiency.
世俗
发表于 2025-3-28 21:22:00
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Euphonious
发表于 2025-3-29 02:39:20
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Oratory
发表于 2025-3-29 05:33:30
Reference Frames,indrical coordinates, adapted to the symmetry of the problem—having a specific origin and orientation. (Note that “reference frame” and “coordinate system” are used in the literature almost synonymously.)
AGATE
发表于 2025-3-29 08:28:54
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Scleroderma
发表于 2025-3-29 12:12:27
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平
发表于 2025-3-29 19:24:19
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小虫
发表于 2025-3-29 23:42:02
Thermal Propulsion,n of the heated gas. The heat usually comes from the combustion of chemical propellants—which we will assume in the following without loss of generality—or from the supply of external heat, or from both. A chemical propellant, therefore, serves two different purposes at the same time: it is a provid
温顺
发表于 2025-3-30 02:36:34
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沙草纸
发表于 2025-3-30 08:05:01
Atmospheric and Ascent Flight,ssion to the planets in our solar system. Before we investigate the rocket’s motion in interplanetary space, it first has to ascent in Earth’s gravitational field through the atmosphere. As will be shown later, ascent and reentry are subject to identical physical laws treated by the science called .