Hi. I'm posting from home near Richmond, MO. I have a Nor'Sea 27 sailboat with a Chinese Junk rig and small diesel inboard. I am considering converting to a diesel / electric hybrid by adding an electric motor aft of the diesel, above the propeller shaft, and using a chain drive from the motor to the shaft. Why chain? Because split sprockets are readily available, and split sprockets and chain can be opened up to install around an existing shaft without a lot of teardown and reassembly.
The plan, should it work out, would be to use sail as my primary source of motive power, electric as preferred secondary power, and the diesel for longer distance travel. I see using the electric by putting the diesel's transmission in neutral - some friction loss, but not a great deal. Possibly I would use the electric to boost the diesel, a wimpy Yanmar SVE8, about 7 1/2 hp and not a lot for an 8,000 lb boat, and under other circumstances let the electric be driven by the diesel as a charger.
It seems likely that members here are aware of the Steyr Motors Parallel Hybrid system, as shown here: http://www.steyr-motors.com/marine-diesel-engines/2-4-and-6-cylinder/full-hybrid-propulsion-system-diesel-and-electric/ I've just borrowed their concept with the idea of retrofitting it to a (significantly lesser) existing diesel installation.
This won't happen tomorrow or next week. I have quite a bit of work to do on the boat before I even consider the electric motor, but I thought I would do well to hang around here and learn for a while.
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