To further control drag and output power over a range of flow velocities, the preferred turbine comprises {TAIL ~ a DC generator} with voltage feedback controlling field excitation, coupled to {HEAD ~ a voltage} and current regulating circuit that performs electrolysis of water to produce hydrogen fuel 
To further control drag and output power over a range of flow velocities , the preferred turbine comprises { TAIL ~ a DC generator } with voltage feedback controlling field excitation , coupled to { HEAD ~ a voltage } and current regulating circuit that performs electrolysis of water to produce hydrogen fuel
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