Thanks for your comments guys, very helpful. But I just had to try it...
Here in New Zealand, surprisingly, for a country that promotes a clean, green image, electric propulsion is relatively rare and so there isn't much of a secondhand market. New electric outboards are quite expensive, in the region of US$180.
So I rigged up an old $5 10" 12v car fan and immersed it in the pool for two hours. It worked fine, with good revs but not a huge amount of torque. Then I waited week to see if internal corrosion would ruin it and ran it again. It ran perfectly again for another three hours.
While it wasn't exactly leaping out of the water, and I probably will need something more powerful as an auxillary, it was an interesting exercise. Maybe with removal of some the blades on the fan, it could almost work...
Thanks again
John
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