Were contra-rotating propellers considered for Yamato or a successor?
Short answerThe answer discusses the recurring design option and its practical drawbacks, without confirming a particular Yamato or successor plan.
NotesContra-rotating propellers recur in naval design discussions because they can offer theoretical advantages. Most navies weigh those gains against mechanical complexity, maintenance, and vulnerability to enemy damage. Those disadvantages usually outweigh the attraction in the answer given here. The discussion explains the general design tradeoff without identifying a specific approved Yamato or successor installation.