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I have always thought that the similarities between an electric outboard and a WattnSea are not so big that one could not consider a device that did both. Much of the development work has already been done, the demands of the DuoGen and WattnSea are known as are the demands for an electric outboard.
If I ever get round to it I have an old Vauxhall alternator in good working order plus a knackered 3HP Johnson OB .