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post #5 of Old 04-06-2012
deckofficer
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Re: Electric Propulsion.

You will do much better in the above scenario with electric. A diesel's torque comes on at 1600~1800 rpm for the small diesels we use, an electric will produce full rated torque at 0 rpm. A slow turning, deep pitched prop can be used on an electric that would stall an ICE when engaged. At slower rpms, slip is less, that is why large container ships turn their screws direct with no reduction. At full ahead sea speed, 108 rpms on a loaded container ship turning a 19' pitch prop might only have 7% slip. Speed at 108 rpm would be 108 X 19' = 2052 X 60 = 123120' / 6082 = 20.2 X .93 = 18.8 kt

Here I have been collecting links to electric and diesel-electric hybrid for sailboats.
Integration of systems

I have served aboard steam turbine, low and med speed diesel, and a small 32000 ton diesel-electric, all having characteristics unique to each.

Bob
WL7GS Whiskey Lima 7 Gone Sailing

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