AVIT 323 block 10-Dilse Exam Questions & Answers 100% Correct!

AVIT 323 block 10-Dilse Exam Questions
& Answers 100% Correct!
Definition of drag - ANSWERSThe component of aerodynamic force that is parallel to
the relative wind and slows the forward motion of the aircraft.
-resistance to air

Parasite drag - ANSWERSType of drag that is NOT associated with the production of lift

Induced drag - ANSWERSDrag associated with the production of lift

Types of parasite drag - ANSWERS-form drag (Separation drag)
-skin friction drag (viscus drag)
-Interference drag (produces two boundary layers 1+1=3)
-Profile drag (combo of skin friction and form drag)
-Cooling drag
-Leakage drag

Viscosity: what type of drag does it affect - ANSWERS-Resistance to shear
-Skin friction (viscus)

Factors that influence parasite drag - ANSWERS-Velocity
-Density
-Aircraft Characteristics
-Aircrafts surface area

Factors that influence skin friction - ANSWERS-Wetted Surface
-Amount of viscous drag in the boundary layer
-Velocity

Boundary Layer and skin friction drag
-including laminar and turbulent flow - ANSWERSLaminar and turbulent flow
-Laminar: small skin friction drag
Turbulent: Lots of skin friction drag

-turbulent air over a wing, decreases drag, because there is less separation, then
making more air going over wing.

Ground effect - ANSWERSAs an airplane nears the ground, the flow over the wing
cannot be deflected as far downward as it can in flight away from the ground. The result
is that the lift is increased and the induced drag is decreased.

Wetted Area - ANSWERSIn direct contact with air