Greetings, the rotors and top and bottom bearing plates are cut from a plastic decking material that I purchased at Lowes. It is made from recycled plastic and saw dust. It is very stable, does not warp or crack, and is not affected by water or ice. It works well for this PMA application. I tried to use it for other projects that needed smaller parts that could handle a lot of stress and I found out that is does brake like fiber board, but it works well for larger parts. It does have limits.
I am off to the shop to perform the bench test again. I noticed that I posted conflicting information about the stator coils. The stators are the same stators used in the earlier test made last year, the only difference is the metal ring added to the rotors. I will post new test data soon. Cheers.