PPRuNe Forums - View Single Post - Helicopter down outside Leicester City Football Club
Old 1st Nov 2018, 23:51
  #458 (permalink)  
Magplug
 
Join Date: Oct 1999
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The mention of 'dead man's curve' by the media is not so much rubbish as is being represented above.

It you suffer a TR failure in any conventional helicopter in a normal hover then you have no option but to check down on the collective and cushion the subsequent touchdown. If you are in a hover high above the ground then your chances of a tidy touchdown diminish with height. Away from the ground the only way to stop the spinning from the anti-torque reaction is to chop both engines by simultaneously retarding both power levers and dump the collective to enter autorotation.

Unfortunately you now have another problem of sorting out the self-induced double engine failure. You now need forward airspeed of at least 40-60 knots to execute an engines-off landing. To gain that airspeed you have to pitch sharply nose-down which not only increases your rate of descent but appreciably kills some of your remaining rotor RPM which is your life blood in executing a successful EOL. The chances of a succcessful EOL from a free-air hover of between 50 and 1000 feet are negligible.... even before you consider the complication of the confined area beneath you..... that's the dead man's curve.
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