AVIT 323 Block 2 Study Guide UPDATED
Exam Questions and CORRECT Answers
In one sentence, define induce drag and be very specific. (six words) - CORRECT
ANSWER - The Aft Acting Component of Lift
Explain sphere of influence. - CORRECT ANSWER - Airflow influenced by the wing
What happens to induced drag as:
aspect ratio goes up?
weight goes up?
speed goes up?
altitude goes up? - CORRECT ANSWER - Decreases
Increases
Decreases
Decreases
Why are wingtip vortices included in induced drag? - CORRECT ANSWER - By
defintion, wingtip vorticies provide induced drag
Define viscosity - CORRECT ANSWER - Resistance to Shear
What causes parasite drag? - CORRECT ANSWER - Everything else (Powerplant cooling,
air conditioning, leakage through access gaps, poor construction)
Define profile drag. - CORRECT ANSWER - Both skin friction drag and form drag
, What is another name for pressure drag? - CORRECT ANSWER - Form Drag
Define interference drag. - CORRECT ANSWER - Drag at the intersection of two bodys
When is interference drag the worst? 90 degrees or 45 degrees? - CORRECT ANSWER -
45
Is total drag constant? - CORRECT ANSWER - No
What makes the total drag move to the right? - CORRECT ANSWER - moving to a higher
altitude
What makes the total drag curve move up? (several items) - CORRECT ANSWER -
Weight, configuration
What makes the total drag curve move down? - CORRECT ANSWER - Streamline, gear
up, antennas in, anything outside and move inside
Explain ground effect. - CORRECT ANSWER - ground effect gives a higher aspect ratio
due to reduced Induced drag
What is another name for the pressure in a given volume? - CORRECT ANSWER - energy
What type of drag decreases when I put vortex generators on my airplane? - CORRECT
ANSWER - Form drag ****
Explain why thrust decreases as aircraft velocity increases. - CORRECT ANSWER - as
speed increases relative wind moves forward, closer to the chordline, thrust provided is less
Ground Effect:
Exam Questions and CORRECT Answers
In one sentence, define induce drag and be very specific. (six words) - CORRECT
ANSWER - The Aft Acting Component of Lift
Explain sphere of influence. - CORRECT ANSWER - Airflow influenced by the wing
What happens to induced drag as:
aspect ratio goes up?
weight goes up?
speed goes up?
altitude goes up? - CORRECT ANSWER - Decreases
Increases
Decreases
Decreases
Why are wingtip vortices included in induced drag? - CORRECT ANSWER - By
defintion, wingtip vorticies provide induced drag
Define viscosity - CORRECT ANSWER - Resistance to Shear
What causes parasite drag? - CORRECT ANSWER - Everything else (Powerplant cooling,
air conditioning, leakage through access gaps, poor construction)
Define profile drag. - CORRECT ANSWER - Both skin friction drag and form drag
, What is another name for pressure drag? - CORRECT ANSWER - Form Drag
Define interference drag. - CORRECT ANSWER - Drag at the intersection of two bodys
When is interference drag the worst? 90 degrees or 45 degrees? - CORRECT ANSWER -
45
Is total drag constant? - CORRECT ANSWER - No
What makes the total drag move to the right? - CORRECT ANSWER - moving to a higher
altitude
What makes the total drag curve move up? (several items) - CORRECT ANSWER -
Weight, configuration
What makes the total drag curve move down? - CORRECT ANSWER - Streamline, gear
up, antennas in, anything outside and move inside
Explain ground effect. - CORRECT ANSWER - ground effect gives a higher aspect ratio
due to reduced Induced drag
What is another name for the pressure in a given volume? - CORRECT ANSWER - energy
What type of drag decreases when I put vortex generators on my airplane? - CORRECT
ANSWER - Form drag ****
Explain why thrust decreases as aircraft velocity increases. - CORRECT ANSWER - as
speed increases relative wind moves forward, closer to the chordline, thrust provided is less
Ground Effect:
