A piston engine doesn't mean you can't have high inertia or payload, it just means that for a given payload and inertia your all up weight will be higher.
As demonstrated by the performance difference between R22 and G2.
G2 is made from contemporary high performance materials and the 22 is made from tin and steel yet outperforms the G2 in IGE/OGE hover by a factor of nearly 2 with the same engine?
If it was all that simple!!
