Fixed wing dude here, just for my own education... what the hell do you attempt to do when the ass end of the aircraft doesn't work anymore... How do you do anything but gyroscopically auger in? Does more power or blade bite make the gyroscoping worse? Clueless and never thought to ask....
Vapes,
The emergency procedure for loss of tail rotor drive is different depending on your altitude.
If you have enough altitude to get into a auto-rotation profile, then that's what you do.
Lowering the collective full down reduces the pitch of the rotor blades which means that no torque is being transfered from the gear box to the blades, the air flow upward through the rotor system is what drives the blades. No torque means no need for counter-torque (tail rotor). During the auto, you kill the engines (because if you re-couple the engines, you are creating torque again and will be back on spin-cycle). At the bottom of the auto, you flare to build additional kinetic energy in the rotor system and then begin to pull collective. Pulling collective increases the pitch of the blades creating lift (and keeps you from plowing into the ground at several thousand FPM). You are not going to spin at the bottom because you are not converting torque to lift (no energy going into the gear box from the engines), you are converting kinetic energy to lift.
The most dangerous flight regime to lose the tail rotor is low speed, low altitude, high torque. This is because there is not enough energy and time to get into a good auto, and because you are at a high torque setting you are going to spin like a MF as soon as the tail rotor lets go.
If this happens, you basically just dump the collective, pull the PCL's (to kill the engines), try to keep it level, and cushion the landing. If you lose the TR low slow and high torque, you are going to crash. It's just a matter of trying to make it as soft as possible so you can (hopefully) walk away.
