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Charging
Richard Casady wrote:
On Sun, 30 Sep 2007 00:44:04 -0400, Wayne.B wrote: On Sat, 29 Sep 2007 20:10:01 GMT, (Richard Casady) wrote: there must be some high output, low rev alternators / generators out there that can do the job. High output and low revs just don't go together. Halving the rpm tends to double the size and weight. There is a reason why they invented gearing. I think maybe you need a big prop and a gearbox. Changing drive pulley size can improve alternator output a lot more easily than props and gear boxes. Another strategy is to install a high output alternator and run it at a reduced rating that still meets your needs. The discussion was about a rope trailing a boat, with a prop on the end in the water, turning the rope and the generator attached to the boat end of the rope. Where do you get a pulley? It is a direct drive we are discussing. Higher output requires either more torque or more rpm, since power is the product of the two. torque available is determained by the prop. No diddlin with the generator can change that. Only a higher output prop can turn a higher output generator. This means more diameter and /or more blades. There is no way around it.There is no available energy from 'nowhere'. Casady A ROPE??? |
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