rotor speed / Nr

Nr gauge (Nr = speed of rotation) / rotor speed sensor

lateral dual rotor system / side-by-side rotor helicopter

main-rotor head / main-rotor hub

main-rotor hub / main-rotor head

main-rotor speed

rotor speed sensor / Nr gauge

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

Motor PWM speed separated from PID speed

brake rotor

tail rotor blade

tilt rotor aircraft

turbine disc / rotor /wheel

idle rotor

inner rotor

aft main rotor

main rotor brake

rotor support damper

coaxial-rotor helicopter

single-rotor helicopter

tandem-rotor helicopter

anti-torque rotor

anti-torque rotor control

anti-torque rotor hub

articulated rotor

ceramet rotor plate

compressor rotor

main rotor hub

rotor bearing

rotor gear pump

rotor lift