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DragonFly is a prototype low-altitude rocket-powered test article for a propulsively-landed version of the SpaceX Dragon space capsule. DragonFly is a suborbital reusable launch vehicle (RLV), intended for low-altitude flight testing. DragonFly is expected to undergo an extensive test program to support reusable rocket technology development for a cargo-carrying and passenger-carrying shuttle capsule. The testing will be done in Texas at the McGregor Rocket Test Facility, and was expected to start in 2014 and run through at least 2015.〔 ==History== In May 2014, SpaceX publicly announced an extensive test program for a propulsively-landed space capsule called ''DragonFly''. The tests will be run in Texas at the McGregor Rocket Test Facility in 2014–2015. An Final Environmental Assessment was issued by the FAA in August 2014. The FAA determined that the DragonFly test program "would not significantly impact the quality of the human environment."〔 〕 The assessment estimated that the program would take two years for SpaceX to complete (2014–2015) and considered a total of 30 annual operations of the DragonFly test vehicle in each year of operation. SpaceX would need to apply for a renewal permit in order to continue into the second full year of flight testing.〔 ==Design== The DragonFly test vehicle will be powered by eight SuperDraco hypergolic rocket engines, arranged in a redundant pattern to support fault-tolerance in the propulsion system design.〔 SuperDracos utilize a storable propellant mixture of monomethyl hydrazine (MMH) fuel and nitrogen tetroxide oxidizer (NTO), the same propellants used in the much smaller Draco thrusters used for attitude control and maneuvering on the first-generation Dragon spacecraft.〔 While SuperDraco engines are capable of of thrust, during use on DragonFly flight test vehicle each will be throttled to less than to maintain vehicle stability.〔 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「DragonFly (rocket)」の詳細全文を読む スポンサード リンク
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