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