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Inflatable Sev
This early 70's inflatable craft drives a 32" integrated 4 blade fiberglass over balsa lift/thrust rotor in a duct. Hypalon is used for the inflated structure, with an extruded aluminum angle bolted frame to add stiffness. A 17hp, single cylinder JLO L270, 17hp at 6000rpm, is the power.
Images reproduced with the permission of Barry Palmer