Shaft generators

[cindersailor]

Here is an interesting thought. Adding a shaft alternator extracts power from the prop rotated by the forward
motion of the boat through the water. With the alternator generating power the shaft is presumably rotating more slowly than it would without the alternator. But we are told that a stationary prop creates less drag than one rotating. Thus by slowing down the prop by adding a shaft alternator we are presumably reducing the drag and allowing the boat to sail faster. Thus we are creating electrical power at the same time as improving boat speed.
Now that's clever, or should I say impossible!

<hr width=100% size=1>

 

[Heckler]

yup
know the theory, but have never tried it out, rest of forumites seem to be saying a locked prop offers less resistance, jury out?
suppose that revs are about the same as that needed to drive at same speed, so need to pulley at aboutish same ratio as gearbox to engine? maybe a bit more? whats the slip in an auto gearbox? cause basically thats what we are trying to do, get a fluid to spin a turbine. and those dual wind / water gennies dont seem to bother speed or performance much
1 hp equals 760ish watts, wow!
stu


<hr width=100% size=1>http://www.beneteau-owners-association.org.uk