Helicopter rotors are designed to operate at a fixed RPM[REF][REF][REF] (within in a narrow range of a few percent),[REF][REF] whereas Carter uses RPM ranges between 100-350 [REF].
Suppliers for the aircraft include Blue Mountain Avionics for avionics and air-to-ground video and telemetry, and Sky Ox Oxygen Systems as the PAV is not pressurized [REF].