Fillcx04

So I am new to rotaries but was hooked after seeing my first year down: I have learned quite a bit a short time but can’t seem to find out a few answers to my questions.

1 why is the only configuration of multi rotor set with a thicc center plate the 20b? Is there an exclusive reason for it?
Whats it’s function over all? Could you in theory run a typical center plate if you had the correct e shaft length?

2 why wasn’t the thick plate used in other configurations like 4 rotor? Would there be any issues in using these in theory again if you had the proper length e shaft?

WJMRTY

The thick plate is to fit and support a stationery gear for the third bearing