The Dragon is a commercial transportation spacecraft developed by California-based Space Exploration Technologies (SpaceX). It is designed as a reusable resupply spacecraft that can transport crew and cargo to the (ISS). The spacecraft can then be recovered from the space orbit.
has been developed in place of the retired space shuttle fleet of Nasa. The first cargo version of the spacecraft was into low Earth orbit space using the Falcon 9 vehicle from Cape Canaveral Air Force Station, in the state of Florida, in December 2010. The SpaceX Dragon became the first private spacecraft to berth at the ISS, on 25 May 2012.
The Dragon was docked to the ISS using the 17.6m robotic arm, Canadarm2 mobile servicing system (MSS). The capsule returned to the Earth's atmosphere and landed in the Pacific Ocean on 31 May.
SpaceX started the first of the 12 contracted supply transport missions to and from the ISS in October 2012. The crew version is expected to be ready for its test flight in 2015. It will have a capacity to carry seven crew members.
Commercial Orbital Transportation Services (COTS) programme and launch
"The Dragon was docked to the ISS using the 17.6m robotic arm, Canadarm2 mobile servicing system (MSS)."
The, COTS Demo Flight 1, was launched in December 2010. It was recovered from the Pacific Ocean off the coast of California. The second launch COTS Demo Flight 2+ was made on 22 May 2012.
Dragon was selected in August 2006 for Nasa's Commercial Orbital Transportation Services (COTS) development programme, initiated in 2005. The space transportation company signed the contract with Nasa under the Commercial Resupply Services programme in December 2008. The $1.6bn contract under the COTS programme is aimed to allow the private company to carry about 20, 000kg of resupplies to the ISS. The contract value is increasable to $3.1bn.
The space complex is currently served by the Russian, Japanese and European resupply spacecraft. SpaceX also signed a contract with Nasa for the Commercial Crew Development (CCDev) programme, in April 2011. Development of the Dragon is expected to have cost about $1bn to SpaceX, including Nasa's contribution of $381m.
Dragon design and phenolic impregnated carbon ablator (PICA) heat shield
The SpaceX Dragon includes a bell-shaped ballistic capsule, a nose cone cap and a trunk equipped with two solar arrays. The 6.1m high Dragon spacecraft has a diameter of 3.7m.
"SpaceX also signed a contract with Nasa for the Commercial Crew Development (CCDev) programme, in April 2011."
Its sidewall angle is 15O. Volume of the capsule section available for pressurised cargo is ten cubic metres. It has a 14 cubic metre section in the trunk for unpressurised cargo. The volume for unpressurised cargo can be increased to 34 cubic metres with an extended trunk section.
The capsule of the spacecraft is recoverable and can be used for multiple missions. The capsule is protected from heat through a tiled phenolic impregnated carbon ablator (PICA) heat shield and SpaceX proprietary ablative material (SPAM) at the backshell. The PICA material also provides protection during its re-entry into the Earth's atmosphere at high velocities (at 3.5Gs).
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NASA's Commercial Orbital Transportation Services: A New Era in Spaceflight - History of International Space Station (ISS) Cargo and Crew, SpaceX, Orbital Sciences, Bigelow
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