SpaceX Dragon spacecraft facts
From SpaceX press kit
Draco Thrusters: Dragon's 18 Draco thrusters permit orbital maneuvering and attitude control. Powered by nitrogen tetroxide/monomethylhydrazine (NTO/MMH) storable propellants; 90 lbf (400 N) thrust is used to control the approach to the ISS, power departure from the ISS, and control Dragon's attitude upon reentry.
Power: Two solar array wings on trunk (eight panels total) produce more than 5 kilowatts of power. Surplus power recharges Dragon's batteries for the periods when it is in darkness. In low-Earth orbit, Dragon is in darkness about 40% of the time.
Avionics: Dual fault-tolerant computing provides seamless real-time backups to all critical avionics components, providing one of the most reliable architectures to fly. The RIOs (remote input/output modules) provide a common computing platform with configurable input and output control cards. This architecture facilitates manufacturing and ensures the components' reliability.
Communications: Communications between Dragon and the ISS are provided by COTS UHF Communications Unit (CUCU). CUCU was delivered to the Space Station on STS-129. The ISS crew commands Dragon using the Crew Command Panel (CCP). Dragon can also communicate on S-band via either tracking and data relay system (TDRSS) or ground stations.
Environmental Control System: Astronauts will enter Dragon to remove cargo. Dragon's cabin is habitable, with air circulation, lighting, fire detection and suppression, air temperature control, pressure and humidity monitoring.
Thermal Protection System: Primary heat shield: Tiled phenolic impregnated carbon ablator (PICA-X), fabricated in-house. The backshell is made of SpaceX Proprietary Ablative Material (SPAM).
Parachutes: Dual drogue parachutes slow and stabilize the craft before three main parachutes bring it to a gentle landing. Dragon can also land safely with only one drogue and one main parachute if needed.
Transporting Crew: While it initially is transporting cargo, Dragon was designed from the beginning to transport crew and is currently undergoing modifications to make this possible. Crew configuration will include life support systems, a crew escape system, and onboard controls that allow the crew to take control from the flight computer when needed. This focus on commonality between cargo and crew configurations minimizes the design effort and simplifies the human-rating process, allowing systems critical to Dragon crew safety and ISS safety to be fully tested on unmanned flights.