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Old 05-06-2012, 08:22 PM
Quartz Quartz is offline
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Join Date: Jan 2003
Location: Home of the haggis
Posts: 27,679
Submarines vs whales vs fish: are propellors more efficient than flukes or tails?

Submarines have propellors; whales have flukes; fish have tails. Which is the most efficient? And what about quietest and least-easy to detect?

(I'm not sure if there are any fish large enough to really count, even if you include the whale shark.)