I had a weird fever dream where I took the 2 12as that I have and built either a 3 or 4 rotor version, would say 20/26b but I guess it wouldn't be that.

Kept it pretty short because I know nothing of what would be necessary and have a feeling this idea is going to get laughed off real quick lmfao

 

Scoot did a 4 rotor. I don't know who but there was a drift AE86 Corolla with a 3 rotor.

 

Don't know if it's been done with a 12A, but it's not recommended because of the effort with using 12A housings and parts support. Has been done with 13B and that is the way to go.

 

Found the 3 rotor, they called it an 18A. There's a clear view of the engine and you can see there's and additional center iron which they had to machine to attach another stationary gear.