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AVIT 323 - Block 10

Terms in this set (35)

Drag is:
resistance to airflow.
Parasite drag is the sum of
all forces acting on plane.
T/F viscosity is part of the reason air separates form the surface of the wing.
True.
The boundary layer is
The area between the surface of the wing and free stream of air.
The area where the laminar flow becomes turbulent is called:
the transition region.
Separation along an aerodynamic object occurs because ___ ?
of adverse pressure gradient & the shape of the object.
Ground Effect has a tendency to make a airplane behave like
it it has a higher aspect ratio.
when a wing is within 1/10 of its span to the surface, its induced drag is reduced
by nearly half
What type of drag is associated with a wetted surface.
Skin friction drag.
Interference drag is caused by
the intersection of two boundary layers.
Which type of drag is associated with pressure drag
form drag.
Which type of drag is reduced by streamlining?
Form drag.
Which type of drag is a combination of skin friction and form drag that affects a wing?
Profile drag.
The dimples on a golf ball are there to reduce _____ at the expense of ___.
form drag, skin friction drag.
Induced drag is greatest when the airplane is at ___ speed and ___ gross weight.
Low / high
As weight increases which direction does the total drag curve move?
Mostly up.
As altitude increase how does this affect the total drag curve?
Induced drag increases and parasite drag decreases; moving the curve to the right.
T/F Laminar flow separates easily, causing more pressure drag than turbulent airflow at high agues of attack.
true.
What factor affects induced drag the most.
Weight.
How does aspect ration affect induced drag?
Higher aspect ratio means lower induced drag.
Induced drag is a byproduct of ___?
lift
the total drag os a subsonic airplane is:
parasite + induced drag
Thrust is used to overcome ___ ?
all the forces acting on an airplane and must be equal to to maintain airspeed in cruise.
T/F as forward speed increases, the angle of attack of a fixed pitch propeller increases.
False, AOA decreases with TAS.
propeller twist is designed to:
all of the above.
In the archer, what effect does torque have on the airframe during large increase of power?
yaw left.
In the archer, what effect does spiraling slipstream have during takeoff?
yaw Left.
In the archer, gyroscopic precession causes what forces during take off rotation?
yaw to the right.
with a positive aircraft pitch attitude compared to the relative wind, your instructor tells you that deceasing blade of the propeller. this causes yaw what is your instructor describing?
P- factor.
T/F brake horsepower is the power output measured at the crankshaft.
true.
The difference between the geometric pitch and the effective pitch is
...
All normally aspirated engines are measured in ___ ?
BHP
the percentage of power from the cruise charts is ___ ?
The percent of power normal rated power at sea level.
In a pure jet engine, all the air entering the engine is burned/consumed.
True.
T/F turbofan engines lose efficiency because air is accelerating around the engine instead of through the combustion chamber.
false - efficiency I increases through transsonic speeds.
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