Bob, I've got a theory question I might put in practice, if I've got the right idea.
I have built a couple of low-horse RPCs. No problems there.
As I study the "rotary transformer" theory, it seems to me that both schematically and practically, there should be absolutely no difference in using multiple lower-horsepower idlers than in using one larger one; perhaps it might matter that they all have the same pole arrangement and speed... but maybe not even then.
And it appears that there would be no benefit derived (or lost) from coupling them mechanically.
Am I on the right track?
I hope so, as I can buy spankin' new-in-box old stock 1-3HP motors for about 1/6th the price of NOS 5-7HP ones.