Jakub Hospodka, Zdeněk Houfek
Efficiency in Carrying Cargo to Earth Orbits
Periodikum: Magazine of Aviation Development
Klíčová slova: Atmosferic drag; Earth rotation; Hohmann transfer; Rockets; Spaceports; Tsiolkovski equation, Atmosférické přetahování; Otáčení země; Hohmannův převod; Rakety; Vesmírné sporty; Tsiolkovského rovnice
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Anotace: Space flights are in these days not any more question of technology, but more question of costs. One way how to decrease cost of launch is change of home spaceport. Change of home spaceport for different rockets is a way to achieve more efficient launches to space. The reason is different acceleration achieved from Earth rotation. We added several mathematical calculations of missions to Low Earth Orbit and Geostationary Earth Orbit to show bonuses from Earth rotation and effect of atmospheric drag on specific rockets used these days. We discussed only already used space vessels. Namely Arianne 5, Delta 4 heavy, Proton-M, Zenit and Falcon9. For reaching GEO we discuss possibility of using Hohmman transfer, because none of aforementioned vessels is available for direct GEO entry. As possible place for launch we discussed spaceports Baikonur, Kennedy Space center, Guyana Space center and Sea Launch platform. We present results in form of additional acceleration for each spaceport, and we also project this additional acceleration in means payload increase. In conclusion we find important differences between vessel effectivity based on spaceport used for launch. Change of launch location may bring significant cost decrease for operators.