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You would need about 4,5 kilowatt/hour for each cubic meter of hydrogen. Assuming the volume of 6-meter diameter aerostat is about 113 cubic meters, you would need about 500 kilowatt/hour to fill just one balloon.Not sure how powerful were dynamos on Japanese submarines, though. US "Balao"-class could provide about 1100 kilowatt while charging batteries.
You would need about 4,5 kilowatt/hour for each cubic meter of hydrogen. Assuming the volume of 6-meter diameter aerostat is about 113 cubic meters, you would need about 500 kilowatt/hour to fill just one balloon.
Not sure how powerful were dynamos on Japanese submarines, though. US "Balao"-class could provide about 1100 kilowatt while charging batteries.
