Hi thank you all for your comments.
Decision made then, larger diameter rotors using all the magnests as opposed to stacking the generators. Just as a point I was initialy thinking of the centre plate being maybe twice the thickness of one of the end plates/rotors.
however;" , you are forming two seperate generators . better to put all the mags on two disks with twice the diam. you get something like 4 or 8 times the power "
If that is a good rule of thumb then that will be the way to plan from here on in.
Thank you again.
Just for my understanding could you define the above statement? Is it because of the rotational velocity of the magnets due to the increase of rotor diameter that more power is achieved? or is there some other element to look for or include.
Regards