Re: Precession effect on helicopter - Why 90 degrees?

"Gyroscopic precession also plays a large role in the flight controls on helicopters. Since the driving force behind helicopters is the rotor disk (which rotates), gyroscopic precession comes into play. If the rotor disk is to be tilted forward (to gain forward velocity), its rotation requires that the downward net force on the blade be applied roughly 90 degrees (depending on blade configuration) before, or when the blade is to one side of the pilot and rotating forward." (Wikipedia)

You may find it from here:
http://en.wikipedia.org/wiki/Precession#Torque-induced

nuny@xxxxxxx wrote:
On Jun 29, 2:05 am, Sammuel <samko...@xxxxxxxxx> wrote:
Hi, I am reading some notes of the precession effect on helicopter, and
it said the left of main blade is 90 degrees ahead of spin.

But why is it '90 degrees' and is 'ahead'???

Where did you find these notes? Seen from above, which way are the
blades spinning?


Mark L. Fergerson
.

Relevant Pages

  • Re: Precession effect on helicopter - Why 90 degrees?
    ... Since the driving force behind helicopters is the rotor disk, ... If the rotor disk is to be tilted forward, its rotation requires that the downward net force on the blade be applied roughly 90 degrees before, or when the blade is to one side of the pilot and rotating forward." ...
    (sci.physics)
  • Re: Precession effect on helicopter - Why 90 degrees?
    ... Since the driving force behind helicopters is the rotor disk, ... If the rotor disk is to be tilted forward, its rotation requires that the downward net force on the blade be applied roughly 90 degrees before, or when the blade is to one side of the pilot and rotating forward." ...
    (sci.physics)
  • Re: Precession effect on helicopter - Why 90 degrees?
    ... Since the driving force behind helicopters is the rotor disk, ... If the rotor disk is to be tilted forward, its rotation requires that the downward net force on the blade be applied roughly 90 degrees before, or when the blade is to one side of the pilot and rotating forward." ...
    (sci.physics)
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