a beautiful boat should sail forever.
Shaft Alternator
Comment
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Comment by Clyde A. Phillips on May 24, 2017 at 8:34pm
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Well, if this doesn't tell you how often I look at things, nothing will. But Paul brought up an interesting question and these things are timeless.
There are details about this setup for charging batteries while sailing that I do not know but what is needed should be easily found. Paul brought up the figure of 180 shaft rotations a minute needed for his generator (alternator?) to be productive. His thinking was that he thought that is enough. I'm thinking it is not shaft rotations that are needed, it is alternator rotation that is critical.. If you mount a pulley on the shaft (a good location is at the coupling) the diameter of the pulley can be increased to increase alternator speed without too many difficulties. The Ackerman designed unit, though somewhat complicated, is reasonably simple and it provides many opportunities to change various pulleys that will change the speed of the alternator. A direct hookup, as Paul has suggested, doesn't allow for "putting the alternator in neutral" which might be advantageous sometimes. A redesign of Paul's idea, adapting parts of Ack's design, could easily add a "Neutral" to Paul's idea.
Peace, Clyde
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Comment by paul ~ sv; pink cloud on April 30, 2013 at 9:41pm
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Hi clyde, i just saw your post, ill study this. Well i found a marine grade low rpm alt/ gen new $299. It will produce charging current from 180 rpm prop shaft rotations. So im leaning that wAy . right off shaft on a pulley fitted on shaft bushing instead of a more complicated pulley assembly.
But .. I would like feed back on the down side to what im suggesting
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