On Thu, 24 Jun 2004 03:51:08 -0500, Richard J Kinch
wrote:



A 25% efficient 5 HP lawnmower engine
dissipates more heat than that, with far less surface area.

Perhaps, but it has the advantage of blowing most of that heat out the
exhaust, instead of raising itself to a temperature that blackbody radiates
it.

Good point. The engine also has forced-air cooling on the fins.
Still, those magnets are pretty big so there's lots of area for
convection air cooling.

To your first point, we don't know that the magnet draws 10KW, only
that it was driven by a generator capable of 10KW. How much power
the magnet really draws is indeed a relevant question.

Yes, and as such, I know now that I need to try to obtain more info
concerning his particular situation. As I mentioned in another post,
I'm getting all of this "second hand" and basically was told he was
looking for a 10KW DC generator.... Hell, for all I know, he may be
using an AC generator :-) Next time I see this "second hand guy",
I will let him know that I could use a bit more into.
Thanks for all the help and suggestions.
Ken.