Just ask Captain Hollywood
I contacted a representative from the manufacturer of the R66 Goat Mk eleventy three?....Captain Hollywood.
As it turns out it seems he will make a helicopter with any number of rotors you want.
I based my choice purely on how it sounded.
Yes maintanance costs are a little high but you should hear my 17 bladed main rotor and 6 bladed rear rotor's..(thats right twin tail boomed) when its purring along on final.
Sweet.
Thanks Captain Hollywood.
Fizics is for dummies.
HF