What is "superdraco"

SuperDraco is a hypergolic propellant liquid rocket engine designed and built by SpaceX. It is part of SpaceX's Draco family of rocket engines. A redundant array of eight SuperDraco engines provides fault-tolerant propulsion for use as a launch escape system and propulsive-landing thrust for the Dragon V2 passenger-carrying space capsule.

SuperDraco rocket engines utilize a storable (non-cryogenic) propellant which allows the engines to be fired many months after fueling and launch.

The engines will be used on crew transport flights to low Earth orbit, and are also projected to be used for entry, descent and landing control of the proposed Red Dragon robotic probe to Mars.

SuperDracos will be used on both the Dragon V2 crew- and cargo-transporting space capsule as well as on the DragonFly suborbital test rocket, a prototype low-altitude reusable rocket that will be used for flight testing various aspects of the propulsive-landing technology. While the engine is capable of of thrust, during use for DragonFly testing, the engines will be throttled to to maintain vehicle stability.