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Old 19th Mar 2017, 11:24
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DOUBLE BOGEY
 
Join Date: Dec 2006
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NJK, I think you may mean, "In zero speed auto when you pull the lever at the bottom".

The answer is if you still had a long way to go to the ground, the effects of VRS would be incipient as the descent continues, but the devil would steel your NR before the effect can fully develop.

If you have the throttle open in auto and the engine starts to drive to rotor as you raise the lever, if the descent continues with little or no airspeed then you will probably enter VRS dependant on the type of helicopter and its characteristics. Some like to enter VRS more than readily than others.

However, to be clear, with the lever fully down the blades will be in an autorotative state. As soon as the lever is raised they are no longer in an autorotative state.......generally.

VRS is only associated with high pitch on the blades and a reasonably high rate of descent with little or no airspeed. To be in autorotation you need minimum pitch on the blades.

So in practice you cannot be in both states at the same time.

Hope that helps a bit.
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