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Describe laminar airflow
Area of the boundary layer where air molecules flow within the streamline
What force opposes and controls the adverse pressure gradient?
The kinetic energy of the relative wind
What is the definition of boundary layer separation?
Point in the streamline where airflow seperates
What is the point of stall on a CL curve
What is the definition of a stall?
when increase in AOA results in decrease in CL
What is the key difference between an aircraft’s stall AOA and stall airspeed?
Stall AOA remains constant – stall airspeed is variable
What are the fators associated with increased thrust that impact stall ccharacteristics?
Vertical thrust component and propeller acceleration factor
Which type of stall will have the lowest stall airspeed?
How do you think increased G loading will affect stall airspeed?
Stall airspeed increases
If maintaining level flight, what happens to stall airspeed as you increase bank angle?
Stall airspeed increases because of the increase in load factor needed to maintain level flight
What is the effect of increased weight on stall airspeed?
Stall airspeed will increase
Higher G loading and higher bank angle = ______ stall airspeed.
What is the basic function of a boundary layer control (BLC) device?
To suppress boundary layer separation
What is the T-6A stall AOA?
What provides stall warning in the T-6?
Stick shacker, AOA gage
What does activation of the stick shaker indicate?
acft is 5-10 knots above stall
What effect does increasing AOA have on the kinetic energy of the relative wind?
What are the benefits provided by Boundary Layer Control (BLC) devices?
Increased maneuvering capabilities, decreased landing speed and distance
What is the only reason the T-6A will stall?
Exceeding T-6A stall AOA (18 units)
Can an aircraft that is not stalled be in a spin?
No. Both stall and yaw must be present to spin.
Define poststall gyration.
Aerodynamic forces during stall that result in movement around the pitch, roll, and yaw axes
What is the key factor affecting the intensity of poststall gyrations?
The airspeed at the time of stall
In a spin, which wing will have the higher AOA, up-going or down-going wing?
Down-going (inside) wing
What is the cause of autorotation in a spin?
Unequal lift and drag forces acting on each wing
If stalled and yawed, which aircraft would enter an inverted spin?
Neither. An aircraft must be in a negative G stall and yaw to enter an inverted spin.
How does anti-spin rudder aid in recovery?
Slows rotation and decreases AOA
Would an aircraft spinning with the stick other than full aft be in an accelerated or unaccelerated
Anytime the aircraft is spinning with the stick other than full aft, the spin is accelerated.
Higher pitch attitude at stall results in ________ spin entry and __________ oscillations.
Will a left or right spin stabilize at a lower pitch attitude?
What causes the variance in left and right spin characteristics?
Gyroscopic effect of the propeller
How does the introduction of yaw affect the lift and drag of a stalled wing?
Causes asymmetrical lift and drag between the outside and inside wing
What conditions must be present to enter an inverted spin?
Negative G stall and yaw introduced
What is the main aerodynamic factor affecting spins?
Conservation of angular momentum
How can a progressive spin be entered?
By maintaining full aft stick while applying and holding anti-spin rudder
Which aircraft will spin at a lower pitch attitude and higher rotation rate?acft spining left or right.
- Right spin
- a. Stabilizes at lower pitch
- b. Stabilizes more slowly with increased oscillations
- c. Rotation rate increased
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