For those who don't believe the governor has an effect on height control in the hover- just try even slow to moderate rate turns in both directions without touching the collective. Turning in the opposite direction of rotation of the main rotor will cause the following to happen: The rotor RPM will initially increase as the pedal is applied (it needs a bit of a push on the pedal to get this effect- don't be too abrupt, but don't be too gentle either). The tail rotor is initially being unloaded, and this will cause the rotor RPM to rise. The governor will attempt to get the rotor RPM back to normal and the 'tighter' the governor, the more pronounced the effect - the Gazelle has a pretty tight governor. For free turbine helos, you'll see the N1 and TOT decrease, for the Gazelle, you'll see the TOT go down slightly. Once the rate of turn is developed, the helo will start to descend. Opposite will happen if you turn in the same direction of rotation as the main rotor. Never seen it not work.. .Tried it in a Bell 407 with the governor in manual mode (fixed fuel flow), and there was no height change. With the governor in automatic mode, there was a pronounced change in engine and height.. .Buy me a beer if it works...