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Propulsion Home : Space : Aeronautics and Aerospace : Propulsion Directory Listing(s) • American Antigravity Developing lifter technology; an experimental form of Field-Effect Propulsion being investigated for commercial transportation and payload delivery. • Manned Missions to Mars Manned missions to Mars, Jupiter, Saturn, and all the outer planets are now possible thanks to a newly developed propulsion system. • SpaceTethers.com Approaches the problem of lowering the cost to orbit by advocating the idea of a small air-launched suborbital RLV to get to an orbiting spinning tether.

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