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A '''launch loop''' or '''Lofstrom loop''' is a published design for an [[active structure]] [[Maglev (transport)|maglev]] [[cable transport]] system intended for [[orbital launch]] that would be around 2,000 km (1,240 mi) long and maintained at an altitude of up to 80 km (50 mi). A launch loop would be held up at this altitude by momentum of the belt as it circulates around the structure. This circulation, in effect, transfers the weight of the structure onto a pair of magnetic bearings, one at each end, which support it.
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==Description==
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A launch loop is proposed to be a structure around 2,000 km long and 80 km high. The loop runs along at 80 km above the earth for 2000 km then descends to earth before looping back on itself rising back to 80 km above the earth to follow the reverse path then looping back to the starting point. The loop would be in the form of a tube, known as the ''sheath''. Floating within the sheath is another continuous tube, known as the ''rotor'' which is a sort of belt or chain. The rotor is an [[Żelazo|Iron]] tube approximately 5 cm (2 inches) in diameter, moving around the loop at 14 km/s (31,000 miles per hour).<ref name=launch1985/>
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===Competing and similar designs===
In works by [http://russianamericanbusiness.org/web_CURRENT/articles/352/1/Alexander-Bolonkin Alexander Bolonkin] <ref>Bolonkin, A.A., Non-Rocket Space Launch and Flight, Elsevier, 2006, 488 pgs.</ref><ref>Paper IAC-2-IAA-1.3.03 by A. Bolonkin at the World Space Congress – 2002, 10–12 October, Houston, TX, USA.</ref><ref>Journal of the British Interplanetary Society, Vol. 56, 2003, No.9/10 , pp.314-327</ref> it is suggested that Lofstrom's project has many non-solved problems and that it is very far from a current technology. For example, the Lofstrom project has expansion joints between 1.5 meter iron plates. Their speeds (under gravitation, friction) can be different and Bolonkin claims that they could wedge in the tube;{{
Another project, the [[space cable]], is a smaller design by [[John Knapman]] that is intended for launch assist for conventional rockets and suborbital tourism. The space cable design uses [[electrodynamic levitation]] rather than [[electromagnetic levitation]] and discrete bolts rather than a continuous rotor, as with the launch loop architecture. John Knapman has also mathematically shown that the meander instability can be tamed.<ref>[http://www.spacecable.org.uk/Stability%20IAC.pdf Space Cable]</ref>
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[[ru:Пусковая петля]]
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