Motorised momentum exchange tether & large two dimensional space webs

The challenge:

The Motorised Momentum Exchange Tether is a propulsion system, invented by M.P.Cartmell in 1996, combining the dynamics of motorised spin of a pair of symmetrical tether sub-spans terminating in payloads, with orbital mechanics so that operation in LEO can generate velocity increments sufficient for interplanetary payload exchange. Recent mission architectures between Earth and Moon confirm the logistics of two-way payload transfers. This also enabled the development of space web dynamics.

How it is solved / purpose of research:

Momentum exchange tethers can hang, liberate, or spin. The symmetrical Motorised Momentum Exchange Tether (MMET) is a radical concept that in the sense that it combines motorised spin with orbital mechanics in such a way that very high interplanetary propulsion performance can be obtained for large payloads of up to 1500-2000 kg. The research has concentrated on analytical modeling of rigid and flexible MMETs in LEO and LLO, which communicate in such a way that two-way payload flow can be maintained between Earth and Moon for the purposes of regular cargo and freight transfers for the Moon when partially terraformed. 

Why it is important / what difference will it make (Impact):

MMETs offer very high performance in an extremely environmentally sensitive manner, whereby solar powered rotation of a massive symmetrical tether is combined with orbital mechanics determined by location in LEO and LLO. The advantage of this is that chemical propulsion is minimised entirely to space planes between Earth and LEO and Moon and LLO. This has massive implications for running costs and environmental protection. Earth-Mars interactions are to be developed. 

Researcher:   Matthew Cartmell