PPRuNe Forums - View Single Post - Police helicopter crashes onto Glasgow pub
Old 15th Dec 2013, 21:26
  #1248 (permalink)  
henra
 
Join Date: May 2010
Location: PLanet Earth
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Originally Posted by SilsoeSid
Of all the videos I've trawled through recently, all the various to the ground autos completed in the past, all the times I've seen someone pull max pitch to slow the blades down that little bit quicker and how I've watched the blades sail past when shutting down with the assistance of the rotor brake .... this blades not rotating really puzzles me.


The painfull thing (and I'm a bit reluctant to type this) is that there is basically only one way to have the rotors practically stopped on arrival and that is if something goes wrong during the entry to the AR.
When messing up the flare it is highly unlikely the time spent at high drag will be sufficient to completely stop the rotor.
As I said before drag in a flare will only be less than half of the drag in a stall. And even in the stall it will take a couple of seconds until the rotor stops even though once past a certain point this process can't be stopped or reverted any more.
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