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He has now designed a Flying Electric Generator, classified as a rotorcraft, using a single tether, designed to operate at an altitude of 15,000 feet and higher where only average winds are sufficient to generate power.
This is an artist's (Ben Shepard's) rendition from Professor Roberts' preliminary working drawings of the next planned Flying Electric Generator rated at 240kW with rotor diameters of 35 feet.
The total swept area for a 1.5 MW Flying Electric Generator with rotor diameters of 88 feet is 24,329 square feet, as compared with a ground base wind turbine 1.5 MW turbine(such as GE Model 1.5sl)with a single rotor diameter of 252.6 feet, total area of 50,115 square feet.