500 watts, peak (350 continuous?), before reduction will be about as effective as an oar. I got schooled on 2kw in about the same size boat (Thanks Myles and Scott), so you might consider holding off until you get hold of a little more power. 5kw seems to work at the 80% functional point. If you do choose to stick with your motor, invest in thermal monitoring with a probe in your motor.
Or do it anyway. Nothing like a little experience. Run your motor at no load and measure the shaft speed. Hooked up on you boat, tune your reduction so the motor can hit about 70 to 80% of the no load speed. This will maximize your power output. Most people under-speed their motors, resulting in high thermal loads, increased brush wear, and under-performance. A well lubed chain drive is noisy but easy to tune. Once you have the ratio, order a HTD timing belt and pulleys from Small Parts/Stock Drive Components or Grainger. Use a 1/2 belt to reduce parasitic losses, but understand a larger motor will require a bigger belt. A pair of deep-cycle group 31 batteries from Kmart and two 12v chargers or solar panels, and you're good to go. And snap a few pictures along the way too,
Arby
Advanced Marine Electric Propulsion
From: artworxz <no_reply@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Sunday, April 1, 2012 7:26 AM
Subject: [Electric Boats] Scooter Motor
I'm new here, and would greatly appreciate any help anyone can give me. I recently purchased a 27' Sailboat, that had the Inborad missing. Has the shaft waiting for whatever. I have a 24 volt 500 watt Scooter Motor, thats been sitting around for a couple of years, and was wondering if I could hook this up to my shaft, and use it only for getting out of the Marina, and returning into my slip. Not looking at performance. If this is possible, could anyone tell me what I would require to make this setup. Just looking for a basic simple way to turn the prop.
Thanks
Thanks
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