Chopper Engine Failure

In the event of an engine failure the helicopter descends in controlled flight through a maneuver called “autorotation.” It is a maneuver requiring great pilot skills. Frequently the aircraft is landed without damage and many pilots would prefer to have an engine failure in a helicopter versus an airplane. Autorotations are less common as the fleet has evolved to twin engine helicopters.

Autorotation explained...
http://en.wikipedia.org/wiki/Autorotation

I would imagine that it is modelled within FS although I've never tried it
😉

I've never been able to get the helicopters in Flight Simulator to autorotate properly. I haven't spent much time on it, could just be me. I have a feeling that it's a mistake in the program.

Microsoft jacked-up the autorotation characteristics of the helicopters.

In a real helicopter, you measure the down-turns with the collective all the way down(This is sometimes refered to as 0* pitch, but it is in reality 4-5 degrees, this keeps the blades spinning... This is the speed that the rotor-blades spin based on air flowing against the positive pitch as the helicopter is pulled to the ground by gravity.

The down-turn percentage should be 100-107% of normal Rotor-Blade speed.

In a real helicopter, push the collective all the way down, then pull up when you get close to the ground.

In the stupid Microsoft helicopter, you have to adjust collective for the autorotation(it is the throttle control in MSFS, the engine speed is non-controllable in the FS helicopter(Well, you can choose idle(60%) or adjust the beeps(99%-102%)). The rotor blades in MSFS are not adjusted correctly, when you put the collective all the way down, they DO go to 0-degree pitch, which means there is no incentive for them to keep spinning, and the drag quickly stops them.

In MSFS, you have to adjust to a rotor pitch which will maintain 100% rotor speed, which is about 1/16-1/8 throttle.

Good luck.