In a piston I can teach you:
- hearing high rotor rpm
- feel high rotor rpm vibration
- proper recovery
-same 3 items for low rotor rpm
- overpitching in flight and recovery
- proper collective / throttle correlation in all phases of flight
- differences of said correlation during a running landing
- effects of higher G-load on rotor rpm
-right stuck pedal landing without ground run using throttle
And of course what Hughes500 said.
We can do all that for $500 an hour, no need to teach hovering at 3k of tax money per hour.
I probably missed one or two items. Feel free to chime in.
I boldly state that you have much more control over an old Schweitzer than you have over that fancy EC155 of yours.