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Re: Towed Generator that We Really Need
All of these things (motors, generators) require a shaft seal to keep water from entering the assembly as the shaft rotates. And shaft seals are typically something like a heavy graphite or other polished ring, pressing against a felt or similar seal. I'd be concerned that the seal in whatever unit you are adapting is designed to seal against thrust, rather than drag, so it is designed to seal with pressure "this way" not "that way". And then it is going to break down and leak in much shorter order, if it is being pushed the opposite way to what it was designed for.
But as long as whatever you are using seems to have a seal that will still work properly, th eonly other question should be figuring out how to efficiently prop it.