Jumo 222: what went wrong?

You are comparing boat engines to aircraft engines. Boat engines can use heavy crankshafts and crankcases in comparison to aircraft engines to handle the torsional vibrations and other problems of the longer crankshaft. According to one source the dry weight of the V-16 used in the Hindenberg was 4400lbs. For 1200hp max And 900hp continuous.

Attached pages from Brandner's autobiography (in german) on the jumo 222