Aircraft Drag Flashcards
What is interference drag?
When vorticies from at different junctions where A/C surfaces meet
What is a way in which interference drag is reduced?
Fillets - used to smooth out cut junctions
What can total drag be broken down into?
Parasite drag and induced drag
What can parasite drag be broken down into?
- Form
- Interference
- Skin friction
When is induced drag higher?
When the wing has to work harder
When does the wing have to work harder
- Low speed
- Banking
- High LF
- Increased AoA
Formula for induced drag
Drag = 0.5 x p x v^2 x S x Cd
Coefficient of drag is equal to…
Coefficient of parasite drag + induced
Factors affecting form drag
- Airspeed
- Frontal area
- Shape and streamlining
Factors affecting skin friction drag
- Speed - high speed = high drag
- Surface area
- Boundary layer conditions
Relationship between airspeed and parasite drag
Parasite drag increases as the square of speed (exponential)
Relationship between flaps and parasite drag
Flaps increase drag because frontal area increases
Primary influences on induced drag
- Speed
- A/C weight
- Manoeuvre
What is 1/2pv^2 equal to?
IAS^2
Impact of speed on induced drag
- Inversely proportional
- As speed increases, wing has less time to act, reducing vorticies, reducing induced drag
