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Old 01-12-2013, 09:39   #32
Nidge41
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Re: Police helicopter crashes into Glasgow pub roof

Quote:
Originally Posted by Chris View Post
You're missing the point ... Autorotation allows you to land a helicopter when the engines are mullered. As long as the rotors can free-wheel, the force of air passing over them as the helicopter falls is sufficient to turn them and slow the descent.

You have major problems when a system failure occurs that prevents the rotors from turning freely or if the helicopter is too low for the airflow to spin them up fast enough to be useful.
And if they can't free wheel or were they to close to the ground for Autorotation to be effective?
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