RE: [Electric Boats] Re: Homemade electric auxillary?

Sounds like good experiment. Only issue I see is that the fan is designed to move a large volume of air at a fairly good speed. Running it in water would slow the fan down too much and reduce thrust. Removing blades may work, but you could instead reduce the diameter and that should work better. Possibly a slightly stronger motor would work.
Fans for air have a different profile normally than a prop does, they're close in form but the fans are typically much lighter and longer at the tips where they almost flatten out. I have a small prop from some antique outboard around here, and the profile of the blades are very close to the same as the fan on my explorer to about three inches beyond the prop diameter, where the fan blades take on a very different profile.

Ken.

> To: electricboats@yahoogroups.com
> From: johnwaddick@yahoo.com
> Date: Fri, 5 Jun 2009 07:42:34 +0000
> Subject: [Electric Boats] Re: Homemade electric auxillary?
>
> 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
>
> -
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
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