I tested a 12x6 propeller and spinner with the trolling motor. What a difference! For the same current draw, the boat goes 25% faster. I'm not seeing any cavitation at all from this prop. The stock 3 blade would cavitate occasionally. Mind you, this is at low speeds, but faster and easier than using the yuloh (sculling oar). Top speed tested was 3.8 knots at 12V, 35A.
The stock prop had a pitch of about 3.5, and was 9.5" diameter.
The new prop is a 12" diameter APC sport prop, which cost $5. The spinner cost $8.
With my 110W panel, which will provide >5A in full sun, I can run indefinitely at 1.5 knots, or more than 5 hours at 3 knots.
Geek phone vid: https://www.flickr.com/photos/12769215@N06/40902847425/in/album-72157672482672575/
I plan to build a fin around the pipe shaft to reduce turbulents. That should improve efficiency even more.
Curtis
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