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Old 08-31-16, 08:06 AM   #1
Catfish
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Default Managing propulsion, Diesel-electric from another thread

Aktung posted some details on how the german boats were managed. I read that again, and don't understand this. Translation errors? Were the interrogators drunk? This or the engineer told them some serious BS

A chief mechanician prisoner, claiming expert knowledge of Diesels, gave the following explanation of the term "Diesel-Electric."

Ok.

"Diesel-Electric" propulsion is used, when it is desired to put one Diesel out of action for repairs or other reasons, and it is nevertheless required to turn both screws. The electric motors are dual-purpose motors. They can be used either as dynamos or as generators as required. The switching over from one use to the other is done by means of a switchboard and a series of resistances. The whole procedure takes but a few seconds.

Hmm, "used either as dynamo or generator"? Isn't that the same? I would have said could either be used as generator/dynamo or as electric engine. You can switch an electric engine to produce electrical current by switching, and make it a dynamo, ok.
A bicycle dynamo is a generator of energy.

If it is required, for example, to stop the port Diesel and keep under way on the other Diesel, the starboard generator is started from the batteries.

What?
Port Diesel is stopped, ok.
Starboard Diesel runs for getting ahead, ok.
Starboard generator is started from the batteries?
WTH does that mean? Either the generator generates energy to be stored in the batteries driven by the Diesel, or it is used as an electric engine by switching it to engine mode and feed it via batteries.
Any Diesel engine is either started by pressured air, or by an electric engine being run, and then coupled to the Diesel to turn and start it.

The cocks are then shut and the Diesel will run under its own power.

Huh?? Which cocks? What does that have to do with it?

The dynamo is then switched off and the speed of the Diesel increased so that the starboard generator produces enough electricity to drive the port dynamo.

What? The (starboard?) dynamo is switched off and starboard generator produces energy? A dynamo is a generator of energy.

The electricity produced is led through the batteries to prevent the current fluctuating.

Ok, understood. Wherever this electricity .. ahh forget it.

The following table, found among captured documents, would therefore, indicate that if one Diesel is turning at 285 revs. at slow speed and the electric motor is coupled with it, the number of revs. is reduced to 240;

Again, what? If the Diesel runs at 285 rpm and the electric motor (in engine mode, not dynamo/generator mode!) is coupled to, it, it reduces rpms to 240 ???

the electricity produced is sufficient to turn the other screw at 155 revs.

So the energy produced by the starboard engine is enough to power the port electric engine (uncoupled from the stopped Diesel) at xxx revs, without using stored battery energy.

The loss in revolutions is due to the loss of power in the process of conversion.

Ok, got to lose some "johnnies" due to loss in the circuits and conversion.

The differences in speed between port and starboard propellers is counteracted by the rudder.

Seems a bit inefficient, slowing the boat even more. Maybe some translator problems back then, eh?
Or i am beginning to understand how Lucas Electrics came into being
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