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Description
This is from another drawing, it is a blow-up of the 'thopter, a ducted fan vehicle used to travel around inside an O'Neill Cylinder from the zero-G hub and land on the inside surface of the colony.

Description
This is from another drawing, it is a blow-up of the 'thopter, a ducted fan vehicle used to travel around inside an O'Neill Cylinder from the zero-G hub and land on the inside surface of the colony.