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The Europa rocket was an early expendable launch system of the European Launcher Development Organisation (ELDO), which was the precursor to the European Space Agency and its Ariane family of launchers. Europa was built to develop space access technology and put European-wide telecommunication and meteorological satellites in orbit. The rocket primarily consisted of Blue Streak, Coralie, and Astris rocket stages. ==History== The British Blue Streak ballistic missile was cancelled in 1960, when it was realised it could not compete with the types of missile that the Americans or Russians were building. As part of deciding how to implement Blue Streak inconspicuously, the British inadvertently arrived at the concept of the missile launch facility (missile silos), although none were actually built in Britain. The difficult storage of liquid oxygen in the rocket stalled the introduction of Blue Streak. The Royal Aircraft Establishment at Farnborough was given the job of considering how the missile could be adapted as a satellite launching vehicle, in conjunction with other rocket stages. Peter Thorneycroft, Baron Thorneycroft, the Minister of Aviation, in 1961 thought about a joint European project, the main intention being not to waste the (advanced) development of the rocket, and not to leave space exploration to the Americans and Russians. A possible Anglo-French collaboration was looked at, and ELDO was signed on 16 April 1962. The three-stage design was arrived at, and given the name Eldo A, later named Europa. In January 1965, the French thought the initial three-stage rocket design would not be sufficiently advanced to carry the size of payloads required, and another rocket - Eldo B - with liquid hydrogen as fuel for the second and third stages to be the better first design, partly due to reduce the cost of the project by eliminating transition test launchers. It would still use the Blue Streak as the first stage. ELDO later disagreed, but the French would get their way, as Eldo B would become Ariane, first launching in 1979. The programme was initiated by the UK and the first launch was planned for November 1966, but the first two-stage launch occurred in August 1967, with three stages (Europa 1) in November 1968. By April 1966, estimated costs had increased to £150 million, from an initial estimated of £70 million. Hopes were not high that it would be suitable for the job. The Italians wanted to give up on ELDO and go for a single European space organisation, not divided nationally as ELDO. Britain was contributing 40% of the costs. In early June 1966, the British government (Fred Mulley) decided it could not afford the cost, and wanted to leave the ELDO organisation - one of the few European organisations in which it was a lead player. This was also at a time when satellite technology was about to change the world. But geosynchronous satellites would need to be 22,000 miles above Earth, not Europa 1's 125 miles altitude. Britain's contribution was reduced to 27%. In mid-November 1968, a European Space Conference in Bonn decided on a proposal to merge ELDO with ESRO to form a pan-European space authority by early 1970; ESA would not be formed until 1975. Britain was lukewarm to the idea, because it did not believe Europe could launch satellites economically. By 1970 the French launch base in French Guiana had cost £45 million, and in that year France became the most important partner in the project, then planning to build two-thirds of the rocket as well as owning the launch site. Although only on paper, Britain's involvement in the project was much reduced, after being largely responsible (with an Australian launch site) for getting the entire project going in the first place. However all of the launchers, to the very end, were completely dependent on the British rocket in the first stage. In 1970 the project was under a perceived economic threat from America's proposed Space Shuttle - Europe knew it could not build (and never has) a similar launcher. However the Space Shuttle would never pose an economic threat due to its immense launch costs. By 1971, over £250 million had been spent on the project, with Europa 2 costing over £4 million. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Europa (rocket)」の詳細全文を読む スポンサード リンク
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