11 Aircraft Drag Flashcards
1
Q
Factors effecting form drag
A
Air speed
Frontal area
Shape and Stream lining
Surface type (smooth/rough)
2
Q
Factors effecting Skin Friction drag
A
Speed
Surface area
Boundary layer type
Surface roughness
3
Q
Effect of weight on induced drag
A
Heavier the aircraft the more induced drag
4
Q
CDI is proportional to
A
CDI is proportional to CL squared ÷ Aspect ratio
5
Q
Parasite Drags relationship with speed
A
proportional to speed squared
6
Q
induced Drags relationship with speed
A
induced drag is inversely proportional to speed squared
7
Q
name all elements of total drag
A
Parasite drag
skin friction drag
form drag
= profile drag
interference drag
induced drag
8
Q
Tip Modifications are used to?
A
Provide a physical barrier to tip vortices, thus reduce induced drag.
- Tip tanks
- Winglets
- Wing fences
However they increase parasite drag.
