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. 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.
Strela cranes mount on opposite sides of the Pirs module.
ISS-30 EVA Oleg Kononenko and Anton Shkaplerov 5.jpg
- Canadarm, which was used on the Space Shuttle
- Dextre, also known as the Special Purpose Dexterous Manipulator (SPDM)
- Mobile Servicing System (MSS), also known by its primary component the Canadarm2
- European Robotic Arm, a robotic arm to be installed on the ISS Russian Orbital Segment in 2017
- The Remote Manipulator System, used on the ISS module Kibo
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- Robert Zimmerman (3 September 2003). Leaving Earth: Space Stations, Rival Superpowers and the Quest for Interplanetary Travel. Henry (Joseph) Press. ISBN 978-0-309-08548-9.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
- "ISS managers working to realign busy launch manifest following ongoing delays". NASA Spaceflight. Retrieved 8 February 2012.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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