From the manual (read me):
" pg. 31
Autorotation is the term used to describe the flight condition which occurs
when a helicopter's rotor blades ceasing turning under power and are instead
driven by the force of the relative wind.
Like most helicopters, the Comanche has the ability to autorotate and continue
flying for a short period of time even after its engines have been turned off
or destroyed. When a helicopter autorotates, its rotors continue turning
because of the force of its downward motion. The faster and longer a
helicopter falls, the greater amount of air is forced upward through its rotor
blades. Obviously, as more air is forced through the rotors the blades are
moved with greater energy.
Autorotation won't get you back to base if your engines are destroyed but it
can get you to the ground in one piece. It's tricky, though. You might want to
practice autorotating a few times while you're still in training.
Climb to a point at least 500 feet AGL (Above Ground Level) and shut off your
engines by pressing the ALT E keys. Your Comanche will begin falling but don't
worry. As air starts rushing through your rotors they will begin turning.
Eventually, the rotors will produce enough lift to slow your descent and give
you some limited directional control. The tricky part of autorotation is
judging just the right moment to "pull pitch" and land. Think of it as
"flaring" a fixed wing aircraft right before touch-down."
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