[Source] The S87 "perpetual charge" power plant dynamo was a powerplant produced by Gurian and used in the Swift Assault 5 hoverscout. A power capacitor initiated a reaction in the blower, and the energy from the reaction was recycled by back-blast impellers into the hoverscout's air cushion in an efficient use of power generation that gave the vehicle a longer range than other hover vehicles of comparable size and type.