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Tuesday, February 28, 2012

>> AEROFOIL & SUBSONIC AIRFLOW

                                                       figure1.1 (by -ICA)

* Symmetrical aerofoil has no camber because the chord-line 
   and  camberline are co-incidental.

* Camber is the asymmetry between the top and the
   bottom  surfaces   of an aerofoil.

* Center of Pressure is the point on chord-line, through which 
   lift is considered to act.

* The pressure differential acting on the surface area will
   produce an upward acting force. If the dynamic pressure
   (IAS) is increased, the upward force will increase.

# At angle of attack ( -4 degree) -The decrease in pressure 
   above   and below the section are equal and no differential exists.
   There will be no Lift Force. This can be called 
   " Zero Lift Angle of Attack ".

* Pitching Moment in aerodynamics-  It is the  moment 
  ( or Torque ) produced by the aerodynamics force is considered 
  to be applied not at the center of pressure,
  but at the aerodynamic   center of the airfoil. The pitching       
  moment on the wing of an airplane is part of the total moment
  that must be balanced using the lift on the horizontal stabilizer.


Formula to calculate co-efficient of Pitching moment

 [ TO STUDY THE LONGITUDINAL STATIC STABILITY OF AIRCRAFT ]


Cm = M / q S c

where: M = pitching moment
           q = dynamic pressure
        S = plan-form area 
        c = length of chord 


Critical Angle of Attack
Angle of attack, which produces Maximum lift co-efficient also called as " stall angle of attack "
       


" Mistakes are not to check where you went wrong, 
                       But to check where you need corrections" 
                                   
                                      - (Anonymous Aspiring Pilot)


NOTICE - THESE NOTES ARE JUST FOR PERSONAL USE AND CANNOT BE USED FOR QUOTING WITH ANY AUTHORITY.
we would like to hear for corrections along with the proof of mistakes on: indiancommercialaviation@gmail..com







6 comments:

  1. really nice blog

    ReplyDelete
  2. Why is the air at the top of the wing accelerating??

    ReplyDelete
  3. This comment has been removed by the author.

    ReplyDelete
  4. Actually air at the top of wing and bot-em is not moving, its aircraft which is travelling through the air. Read theory of continuity and Bernoulli`s theorem as well to clear your doubt on how it is accelerating. - Blogger, ICA

    ReplyDelete

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