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SpaceX Crew Dragon

History

SpaceX Crew Dragon is a reusable crewed spacecraft developed in the United States for transport between Earth and low orbit. It is the crew-carrying version of the Dragon 2 family and was created primarily for NASA's Commercial Crew Program. The vehicle also supports private missions to low Earth orbit and the International Space Station.

Development

Crew Dragon evolved from SpaceX's first-generation Dragon cargo vehicle. NASA selected SpaceX in 2014 to complete development and certification of a commercial crew transportation system. The new spacecraft incorporated life-support equipment, seats and displays for astronauts, autonomous docking, and an integrated launch escape system.

The uncrewed Demo-1 spacecraft reached the International Space Station in March 2019. A ground-test vehicle was lost during a SuperDraco firing test in April 2019, leading to an investigation and changes to the propulsion system. SpaceX then conducted an in-flight abort demonstration in January 2020.

Flight testing

The Demo-2 mission launched astronauts Douglas Hurley and Robert Behnken on 30 May 2020. It was the first crewed orbital flight launched from the United States since the Space Shuttle's final mission in 2011 and the first crewed flight of a privately developed orbital spacecraft. Demo-2 docked with the International Space Station and returned by parachute-assisted ocean splashdown in August 2020.

Operational service

NASA certification enabled regular Commercial Crew rotation missions to the International Space Station. Crew Dragon has also flown private astronaut missions, including independent orbital flights and commercially organized visits to the station. SpaceX operates a fleet of named capsules and refurbishes them between missions.

The operational life of each capsule is governed by certification, inspection results, component limits, and mission requirements. SpaceX has stated that the fleet retains substantial service life, but the company has not committed publicly to an indefinite production or retirement date.

Design

Crew Dragon consists of a reusable pressurized capsule and an expendable trunk. The capsule carries the crew, avionics, life-support equipment, maneuvering thrusters, heat shield, and parachutes. The trunk provides structural support during launch, solar power, thermal-control radiators, and space for unpressurized payload.

Cabin and controls

The pressurized cabin has a published volume of 9.3 cubic metres. Normal NASA missions carry four people, although the basic vehicle was designed with accommodation for as many as seven. The crew uses touchscreen displays supported by physical controls for critical functions. The spacecraft can launch, rendezvous, dock, depart, and return largely autonomously, while the crew and ground controllers retain command capability.

Propulsion and escape system

Sixteen Draco thrusters provide attitude control and orbital maneuvering. Eight more powerful SuperDraco engines are integrated into the capsule in four pods for launch escape. The escape system can pull the capsule away from a failing launch vehicle during critical portions of ascent and avoids the separate jettisonable escape tower used by many earlier spacecraft.

Docking

Crew Dragon uses a nose-mounted docking mechanism compatible with the International Docking System Standard. A hinged nose cone protects the mechanism during launch and atmospheric entry. Automated rendezvous sensors and flight software guide the vehicle to the station, where it docks directly rather than being captured by a robotic arm.

Launch and recovery

The spacecraft launches on a Falcon 9 Block 5 rocket. Before atmospheric entry, the trunk is discarded. The capsule uses its heat shield to survive reentry and descends under four main parachutes to an ocean splashdown. Recovery ships retrieve the capsule and support medical checks and crew egress.

Operational history

Crew Dragon became NASA's principal United States crew transport to the International Space Station after Demo-2. Operational missions typically remain docked for several months and serve as an emergency return vehicle for their crews. The program restored a domestic US capability for routine crew launch and reduced reliance on purchased Soyuz seats.

Private missions have demonstrated uses beyond NASA crew rotation. These flights have included free-flying orbital missions and visits to the International Space Station. Mission duration, crew composition, orbit, and equipment vary, but all use the same basic capsule and Falcon 9 launch architecture.