So I had a wild thought...why not take a C-18 and put it in a B/C model Hiller? They already put the C-20 in the E models.
Reason for the B/C conversion is the minimal quanity of finite parts on the machine and blades that are very affordable to replace. Which in turn, would make it most likely the cheapest turbine to operate.
But...the couple Hiller A&P's I have ran it by said no because the tail rotor on the B/C's are on the opposite side compared to the E.
I can't quite understand why that is an issue though? Anybody have any ideas?