Post #36353 by onepoorguy on the US Policy board

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By the way, even though I didn't (as best as I can remember) jump in on the conversation, I don't believe an object as big as the one under discussion could travel that fast. Heck I was surprised to learn that torpedoes can go as fast as they do.

They have to worry less about cavitation. It doesn't matter if a torpedo is silent, or at least not that much. It's much smaller, so even if noisy, it's still relatively quiet. It's more an issue for guidance/control (cavitation can disrupt control surfaces). But various underwater listening devices likely will detect it if a torpedo is fired, even if they didn't detect the submarine that fired it. That likely won't save the ship it was aimed at.

A lot of research was put into propeller designs for subs. You want maximum performance without cavitation.

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