Join Date: Oct 2008
Location: South Coast Ontario
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There is no advantage and probably no real cost savings.
I'm sure one or two of the "silent runnings" types will come along and clarify my numbers, but here's my thinking: Theoretically, you would get twice the thrust, but you need two banks of batteries, so twice the weight, and nearly twice the consumption as running a single motor with higher thrust. Over the long term you will have to replace twice as many batteries, and have twice as many moving parts to maintain, which is why there is likely no long term cost savings over a single motor.
The only real advantage is that you could improve your tight quarters maneuvering.