To realize generally space structures (such as space elevators and the like) in which special spaceships and their types of (connected/permanent air flow circulation type) power units solely not requiring (any disposable expensive) rocket fuel and with superior propulsion efficiency than that of a solar ship and the like several steps above are applied also in a complex manner.
Each of the propulsion bodies (two bodies with different shapes) that can be moved under application of wind power of the ducted fans and the like in which wind pressure/pressure differential applied to both ends are used is prepared, these both bodies are properly moved in parallel without being compensated to each other under action or counter-action (under application of aerodynamic lifting power applied around the hollow part within a craft) while further propellant (dirt-cheap air-gas) blown out of one of the bodies is being fully accepted (sucked) by one receiving body and they are mostly approaching to each other.
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