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Re: Optimal propulsion system
delta, propane has a very low energy density compared to diesel. Which is why ships and submarines and even locomotives use diesel-electric propulsion very successfully, but never use propane-electric.
Propane will work if you can get it very frequently, very conveniently, very cheaply, and you've got lots of storage space. But unless you've got a rare boat operating n a rare environment, forget about it.