...Like the mixed Steam and Diesel propulsion of most German warships
Not quite sure about this. The H-class was never finished, so the Königsberg and Nürnberg class
were the only fighting ships combining steam and diesel propulsion, AFAIK. According to Gröner, in the Königsberg
class the system clearly was COSOD, because the Diesel engines had to be shut down before using the steam
turbines and vice versa, so actually a kind of a handicap for any situation, when combat maneuvers had to be
expected. With Diesel only, the ship was limited to the speed of about 10 knots. There was a so-called "alarm
ignition" procedure, giving steam pressure "in some minutes" (?), but this probably was pricy and this method
is mentioned as only to be used "by bypassing all safety standards"
In the Nürnberg/Leipzig class it was a kind of COSAD. The ships had 3 shafts with only the inner one driven by Diesel
engines. The outer shafts could be driven electrically to avoid drag losses, when the steam propulsion was shut
down. Full power meant steam + Diesel here.