上涨
发表于 2025-3-28 15:34:47
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SOW
发表于 2025-3-28 20:10:12
The Respectability of Astronautics as Reflected by Recent Developments in the United StatesBy consolidating information from many scientific disciplines it is easy to show that work of vital importance to astronautics is being carried on in the U.S.A. In most cases neither the work nor the workers are specifically directed towards the spaceflight goal, but the net effect of present-day contributions is encouraging.
不遵守
发表于 2025-3-29 01:18:29
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Fracture
发表于 2025-3-29 04:22:06
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crockery
发表于 2025-3-29 09:46:40
Naturalismuskritik und Metaphorologie,esented. It is pointed out that solid propellants compare very favorably with liquid propellants especially for applications in high altitude rockets and in boosters for space aggregates. Because of high reliability and good storage characteristics, applications in space will be many. The progress d
胆汁
发表于 2025-3-29 13:00:17
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Irrepressible
发表于 2025-3-29 16:29:58
Wolfgang Ballwieser,Karl-Heinz Bergertung. Turbopumpen werden oft als Herz der Raketentriebwerke bezeichnet, da sie nicht nur den Schub regeln, sondern auch entscheidend zur Betriebssicherheit des ganzen Aggregates beitragen. Die Antriebsseite der Turbopumpe ist meist eine Dampf- oder Gasturbine mit einem besonderen Gasgenerator. Es we
得意牛
发表于 2025-3-29 23:40:52
Information und Wirtschaftlichkeitumper screen, is investigated theoretically. It is assumed that when a meteorite hits a bumper screen, the whole of its kinetic energy is transformed into heat. This heat, which is generated at the point of collision, is considered to spread through a hemispherical volume of the screen, and if the r
enlist
发表于 2025-3-30 01:50:22
Wolfgang Ballwieser,Karl-Heinz Berger preliminary design utilizing this method is presented for a 1000 ton, high performance space ship incorporating a linear electronic accelerator drive, which is also described. A characteristic velocity of 26 mi/sec (or 2.27 million miles/day) is given for this design.
Consensus
发表于 2025-3-30 04:09:05
Wolfgang Ballwieser,Karl-Heinz Berger in which a suitable propellant (cesium or rubidium) is vaporized and ionized at incandescent platinum surfaces. Ions and electrons are accelerated and expelled at equal rates; they recombine immediately after leaving the thrust chambers. The power for the accelerating fields is obtained from turbo-