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Strela (crane)
The Strela (Russian Стрела, means Arrow) cranes are four Russian built cargo cranes used during EVAs to move cosmonauts and components around the exterior of the Soviet/Russian space station ''Mir'' and the Russian Orbital Segment of the International Space Station. ''Mir'' featured two cranes mounted to its core module (delivered by Progress spacecraft), and the ISS also possesses two cranes, mounted to ''Pirs'' (they were carried to the ISS on Integrated Cargo Carriers, the first on STS-96, the second on STS-101). The cranes are unpowered telescopic poles assembled in sections, which measure around 6 feet (182 cm) when collapsed but, when extended using a hand crank, measure 46 feet (14 m) long.〔http://www.space.com/14599-russia-cosmonauts-space-station-spacewalk-expedition30.html〕 This means that the cranes on ''Mir'' could easily reach all of the main modules of the complex, and those attached to the ISS can be used to transfer objects the full length of the Russian Orbital Segment(ROS), from ''Zvezda'' to ''Zarya''.
The largest robotic arm on the ISS, Canadarm2 weighs 1,800 kilograms and is used to hold crew members during EVA's, move station modules, spacecraft, orbital replacement units and Dextre on the US Orbital Segment. The ROS does not require spacecraft or modules to be manipulated, as all spacecraft and modules dock automatically, and may be repositioned or discarded the same way. Each strela crane weighs 45 kg and can perform all necessary tasks, with substantial weight savings, less complexity and less maintenance than the Canadarm2 and the European Robotic Arm.
An EVA planned for February, 2012 will see one Strela crane relocated to the docking compartment ''Poisk''. Shortly afterwards another Strela crane will be relocated to ''Zarya''. These moves are required because ''Pirs'' will be detached soon after and deorbited to allow the MLM ''Nauka'' to dock to the ''Pirs'' current location in mid-2012.〔(【引用サイトリンク】url=http://www.nasaspaceflight.com/2012/02/iss-managers-realign-busy-launch-manifest-ongoing-delays/ )〕
==Strela cranes mount on opposite sides of the Pirs module.==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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