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Sailing submarine

 The ultimate quiet propulsion system
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Equip submarines with external sails sans masts. Control the sails via cables attached to the sails at various points.

Ride the currents just like a schooner rides the tradewinds, tacking to move "upcurrent" or just up and down.

—phoenix, Oct 28 2003

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       I suspect the ocean currents are not generally fast enough for your porpoises.
—DrCurry, Oct 28 2003
   

       You mean porpoises, surely [DC].
—squeak, Oct 28 2003
   

       Porpoises don't ride in submarines.
—phoenix, Oct 28 2003
   

       you can only get propulsion from these currents if you are in a spot of water that mover the other way (just like sailing) ocean currents reach a few miles per hour max, so you wil not be able to go very fast.
—nietsch, Mar 21 2004
   


 

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