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Draco is a family of hypergolic liquid rocket engines designed and built by SpaceX for use in their launch vehicles and space capsules. Two engines have been built to date: Draco and SuperDraco. A Draco thruster is a small rocket engine for use on the Dragon spacecraft,〔 〕 as well as on the upper stages of the Falcon 9〔 〕 and Falcon Heavy rockets, to provide for spacecraft attitude control in the vacuum of space. SuperDraco rocket engines utilize the same storable (non-cryogenic) propellant as the small Draco thrusters, but are over 100 times larger in terms of delivered thrust. The much larger Super Draco engines will be used on later versions of the Dragon spacecraft to provide launch-escape capability on crew transport flights to low Earth orbit, as well as entry, descent and landing control of the proposed Red Dragon robotic probe to Mars. ==Draco== Draco thrusters generate 400 newtons (90 pounds-force) of thrust using a storable propellant mixture of monomethyl hydrazine fuel and nitrogen tetroxide oxidizer. The Draco thrust is comparable to the Marquardt R-4D engine developed for the Apollo Service and Lunar Modules in 1960s and used for apogee/perigee maneuvers, orbit adjustment, and attitude control. Eighteen Draco thrusters are used on the Dragon spacecraft for attitude control and maneuvering.〔 〕 This system is not dual-redundant in all axes; rotational and translational control by thruster requires at least 7 thrusters. Four Draco thrusters are used on the Falcon 9 second-stage as a reaction control system.〔 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「Draco (rocket engine family)」の詳細全文を読む スポンサード リンク
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