Pre-Rotator Powered by Compressed Air?

I believe that in order to have the capability for a jump take-off,
the rotor blades would have to be depitched to zero, and then when a
lot of rotor rpm is built up, the pitch has to be added in rather
rapidly to achieve the jump.

Ken J. - Sandy A. Gowe

Ken,

I've heard that they actually overspeed the rotor system relative to it's
normal autorotative rpm. The added inertia is what gets them airborne but it's
then critical to get some forward speed going so it can establish an
autorotative state when the rotor system slows back down to normal rpms.

I've also heard that they actually over pitch the rotor blades to make the jump
and that has to be let back down to a setting that will allow the rotor blades
to establish an autorotative state as the aircraft accelerates forward. This
part really makes me wonder. It sounds like it would be pretty critical to get
it right. Can confirm whether this is true or not?

Wondering!
Fly Safe,
Steve R.