12.6.6. Define relative airflow and angle of attack.

Relative Airflow:
The airflow which is remote from the aircraft and unaffected by its passage through it

Angle of attack:
The angle of attack is the angle between the chord line and the Relative Air Flow (image)

12.6.4(f) . camber. 

Is the curvature of an aerofoil surface.
The curvature of a line drawn equidistant between the upper and lower surfaces of the aerofoil is the mean camber of the aerofoil.
(image)

12.6.4(e) . thickness; 

The depth of the aerofoil
On most aerofoils the point of maximum thickness is forward towards the leading edge

12.6.4(d) . chord line; 

A straight line joining the leading and trailing edges.

12.6.4(c) . chord; 

The length of a straight line joining the leading and trailing edges (Image)

12.6.4(b) . trailing edge; 

The edge at the downstream side (image)

12.6.4. Define:

Aerofoil


Term
Description




(a) . leading edge;


 

The edge facing into the airstream ( Image)








(b) . trailing edge;






 
The edge at the downstream side (image) 



(c) . chord; 





The length of a straight line joining the leading and

        trailing edges (Image)



(d) . chord line


; 
A straight line joining the leading and trailing edges.








(e) . thickness;






The depth of the aerofoil 
On most aerofoils the point of maximum thickness is forward towards the leading edge 



(f) . camber. 




Is the curvature of an aerofoil surface.

The curvature of a line drawn equidistant between the upper and lower surfaces of the aerofoil is the mean camber of the aerofoil.
(image) 



 
        

         
    

12.6.2. Describe what an aerofoil is and distinguish between different aerofoil designs.

The wings and tail sections of an aircarft are aerofoils

Various designs include:
General Purpose
High lift
Pre-1916
High Speed (image)

12.4.16. State the approximate temperature lapse rate up to the tropopause.

The ISA temperature lapse rate up to the Troposhere is 1.98degC per 1000ft.