Performance IV Flashcards
For the ratios CL^(1/2) / CD CL / CD CL^(3/2) / CD All are dependent upon \_\_\_\_\_\_.
The drag polar for the aircraft.
At (CL/CD) max, what is the relationship between the induced drag coefficient and the parasite drag coefficient?
CD0 = CDi
The fact the when L/D is at a maximum, when CD0 =- CDi is a ____________.
Function of the form of the drag polar.
Thrust required is at a _______ when L/D is at a ______.
Min
Max
When CL^(3/2) /CD is at a maximum, what is the relationship between the induced drag coefficient and the parasite drag coefficient?
CD0 = (1/3)*CDi
When CL^(1/2) /CD is at a maximum, what is the relationship between the induced drag coefficient and the parasite drag coefficient?
CD0 = 3*CDi
True or False
The max values of CL^(3/2) / CD and CL^(1/2)/CD are dependent on altitude and velocity.
False
CL^(3/2) / CD and CL^(1/2)/CD only depend on the aerodynamic design of the AC (i.e. the drag polar).
True or False
The max values of CL^(3/2) / CD and CL^(1/2)/CD are independent of altitude but dependent on velocity.
False
CL^(3/2) / CD and CL^(1/2)/CD only depend on the aerodynamic design of the AC (i.e. the drag polar).
True or False
The max values of CL^(3/2) / CD and CL^(1/2)/CD are dependent on altitude but independent of velocity.
False
CL^(3/2) / CD and CL^(1/2)/CD only depend on the aerodynamic design of the AC (i.e. the drag polar).
True or False
L/D at any particular point (other than L/D max) is dependent upon both altitude and velocity.
True
CL/CD Max depends on what three parameters?
- The Oswalt efficiency factor.
- The aspect ratio
- The parasite drag coefficient (CD0)
True or False
The value of (CL/CD) max does not depend on altitude. However; the velocity at which it is obtained does vary with altitude.
True
True or False
The value of (CL/CD) max depends on altitude.
False
The value of (CL/CD) max does not depend on altitude. However; the velocity at which it is obtained does vary with altitude.
