Turfdr--these are both Delco's, Not sure why the difference in appearance
of the lam's, I think it's just the stamping process. The key difference
is the number of lam's. The more/thinner the better. It seems to make a
small difference in cogging. The top one appears to have 10 turns per coil. The more turns the better, but I believe 12 turns was the max made.
That stator was made for alts on tractors and the like that turn lower
rpm.
For any realistic rpm, you will have to rewind. After many tries, I think
the best I could fit in was 19 wraps of #18 wire.
Also, for any realistic rpm, throw away the winding in the rotor and replace with a large neo ring, or any other method of getting a lot of neo
in there.
All this will get you some usable power out of a set of 5 foot blades.
After saying all that, and if you decide to do the work, use the larger
Delco. The larger stator/rotor will produce a higher voltage at the same
rpm, all other things being equal.
Again, if you decide to go this route, and I can be of help, just ask--my
E-mail is on the board. Just include something about Otherpower in the
subject line.
bj
good luck