AVIT 323 block 10-Dilse UPDATED Exam
Questions and CORRECT Answers
Definition of drag - CORRECT ANSWER - The component of aerodynamic force that is
parallel to the relative wind and slows the forward motion of the aircraft.
-resistance to air
Parasite drag - CORRECT ANSWER - Type of drag that is NOT associated with the
production of lift
Induced drag - CORRECT ANSWER - Drag associated with the production of lift
Types of parasite drag - CORRECT ANSWER - -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 - CORRECT ANSWER - -Resistance to shear
-Skin friction (viscus)
Factors that influence parasite drag - CORRECT ANSWER - -Velocity
-Density
-Aircraft Characteristics
-Aircrafts surface area
Factors that influence skin friction - CORRECT ANSWER - -Wetted Surface
, -Amount of viscous drag in the boundary layer
-Velocity
Boundary Layer and skin friction drag
-including laminar and turbulent flow - CORRECT ANSWER - Laminar 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 - CORRECT ANSWER - As 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 - CORRECT ANSWER - In direct contact with air
Interferance drag - CORRECT ANSWER - occurs when the airflow around one part of the
airplane interacts with the airflow around an adjacent part.
1+1=3
Flat plate equivalent - CORRECT ANSWER - -The PARASITE area of an aircraft which
causes flow of air to change direction.
-Is found by placing an aircraft at an AOA that has zero lift (so only parasite drag remains)
If you only have parasite drag, you have flat plate area
Mooney vs. 152 - CORRECT ANSWER - Mooney has a bigger wing area, so it can hold
more, therefore it has a smaller flat plate area because the drag will be less
??
Questions and CORRECT Answers
Definition of drag - CORRECT ANSWER - The component of aerodynamic force that is
parallel to the relative wind and slows the forward motion of the aircraft.
-resistance to air
Parasite drag - CORRECT ANSWER - Type of drag that is NOT associated with the
production of lift
Induced drag - CORRECT ANSWER - Drag associated with the production of lift
Types of parasite drag - CORRECT ANSWER - -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 - CORRECT ANSWER - -Resistance to shear
-Skin friction (viscus)
Factors that influence parasite drag - CORRECT ANSWER - -Velocity
-Density
-Aircraft Characteristics
-Aircrafts surface area
Factors that influence skin friction - CORRECT ANSWER - -Wetted Surface
, -Amount of viscous drag in the boundary layer
-Velocity
Boundary Layer and skin friction drag
-including laminar and turbulent flow - CORRECT ANSWER - Laminar 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 - CORRECT ANSWER - As 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 - CORRECT ANSWER - In direct contact with air
Interferance drag - CORRECT ANSWER - occurs when the airflow around one part of the
airplane interacts with the airflow around an adjacent part.
1+1=3
Flat plate equivalent - CORRECT ANSWER - -The PARASITE area of an aircraft which
causes flow of air to change direction.
-Is found by placing an aircraft at an AOA that has zero lift (so only parasite drag remains)
If you only have parasite drag, you have flat plate area
Mooney vs. 152 - CORRECT ANSWER - Mooney has a bigger wing area, so it can hold
more, therefore it has a smaller flat plate area because the drag will be less
??
