Want to share some findings on my 38 ft sailboat, and ask a question. Initial testing with an ME0709 Motor belt coupled to propeller shaft behind the Hurst transmission on my diesel provided pretty decent electric drive results. The Drive ratio was about 2.75:1 between motor and prop shaft. Even though the motor was capable of accepting 24 to 72 VDC, I found running at between 36 and 48 Volts provided satisfactory results, considering I still have a working 50 HP diesel when needed.
In order to transmit the motor torque at 48 Volts, I had to jump up to a BX cogged V-belt. It seemed to operate without slippage. However the relative friction was too great to be really useful for regeneration. With a lighter "A" size belt I was able to charge my 12 volt house battery by allowing the prop to drive the motor while sailing at anything over 4 knots. This is a very useful benefit considering 90% of my time on the water is sailing.
So in order to have both low friction and good torque transmission, I think my next iteration will be to a single timing belt drive. Looking for suggestions on type and size of timing belt assuming I need to transmit at most 8 HP with about 1500 RPM at smaller pulley
Thanks
Art
Posted by: jortlif@msn.com
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