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Liquid Fly-back Booster (LFBB) is a cancelled German Aerospace Center's (DLR's) project to develop a reusable liquid rocket booster for Ariane 5 in order to significantly reduce a high cost of space transportation and increase environmental friendliness.〔 LFBB would replace existing solid rocket boosters, providing main thrust during the liftoff. Once separated, two winged boosters would perform an atmospheric entry, fly back autonomously to the French Guiana, and land horizontally on the airport like an airplane. Additionally a family of derivative launch vehicles was proposed in order to take an advantage of economies of scale, further reducing launch costs. These derivatives include a Reusable First Stage in a class of small and medium size launch vehicles like Vega and Arianespace Soyuz, the Super-Heavy Lift Launcher capable of lifting nearly 70 tonnes to the orbit,〔〔 and a Two-Stage-To-Orbit system operating a dedicated reusable orbiter. German Aerospace Center studied Liquid Fly-back Boosters as a part of future launcher research program from 1999 to 2004. After the cancellation of the project, publications at DLR continued until 2009. == Development == The German Aerospace Center (DLR) studied potential future launch vehicles of the European Union under the ''Ausgewählte Systeme und Technologien für Raumtransport'' (ASTRA; English: Systems and Technologies for Space Transportation Applications) programme from 1999 to 2005, with additional studies continuing until 2009.〔 The LFBB design was one of two projects within the ASTRA program, the other being Phoenix RLV.〔(【引用サイトリンク】title=Space Launcher Systems Analysis (SART) )〕〔(【引用サイトリンク】Liquid Fly-back Booster (LFBB) )〕 During development, scale models were constructed for testing various configurations in DLR's supersonic ''Trisonische Messstrecke Köln'' (TMK; English: Trisonic measuring section at Cologne) and in their ''Hyperschallwindkanal 2 Köln'' (H2K; English: Hypersonic wind canal at Cologne) wind tunnels. The preliminary mechanical design of other major elements was done by the companies EADS Space Transportation and MAN.〔 The advantages of reusable boosters include simplicity from using only one type of fuel, environmental friendliness, and lower reoccurring costs. Studies concluded that reusable fly-back boosters would be the most affordable and the least risky way for European space launch systems to start becoming reusable. These fly-back boosters had the potential to reduce launch costs. However, when other projects, such as Space Shuttle or VentureStar, undertook this objective, they failed to meet their goals. Supporting technologies needed for LFBB construction can be developed within 10 years, and additional launchers can be developed based on fly-back boosters to minimise costs and provide maintenance synergy across multiple classes of launch vehicles.〔 Eventually, the hardware grew too large and the LFBB project was scrapped, with one member of the French space agency (CNES) remarking: 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「Liquid fly-back booster」の詳細全文を読む スポンサード リンク
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