Centre of pressure of an aircraft.

Hey hello guys.
Today I am going to explain you about the concept centre of pressure many of the people would get confused with this word relating with aerodynamic centre.
☑️What makes an  aircraft fly✈️?
The answer is wing, that is wing produces sufficient amount of lift to overcome the drag and weight.

• Now, at what point the lift acts .

The point is non other than centre of pressure.

• As the airfoil is subjected to pressure force and shear stress distribution over it.
  
• They combinely give a resultant vector (R) as shown above.
• Now we can break the resultant vector into two components with respect to free velocity(v infinity). The component that is normal(perpendicular ) free stream velocity is called as 'Lift'.
• And the component that is parallel to the free stream is called as 'Drag'.
• Lift and drag are also called as aerodynamic forces.

Sometimes the resultant vector may breakup with respect to  the chord line.

• The component which is perpendicular to chord line gives 'normal force' and the component which is parallel to the chord line gives 'axial force'.( As shown above)

☑️Sign convention used for moments.

☑️ Pressure variation over an airfoil.

☑️CFD analysis over an airfoil.

So finally I can say that lift and drag are the component of resultant vector which act through the centre of pressure .

☑️And important thing to note that as angle of attack changes centre of pressure also changes.that is the distribution of pressure over the airfoil changes 

Thank you for reading..
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