Stalling Flashcards
LBBB
Lookout, bank, balance and back pressure
Recovery
Recovery: Incipient and actual stall – relax back pressure (unload it), apply full power.
Slipstream hits left so right rudder is used.
At safe speed raise nose and begin climb. If flap is out retract in stages.
HASELL: Hieght recovery by 3000 feet, airframe configuration (flaps, AOB, power, trim), security secure everything, engine, location-unpopulated areas and lookout.
Entering
Entering Stall: Power smoothly reduce power to idle, attitude, keep straight, ailerons neutral and maintain altitude, stall enter and recover stall.
Symptoms
Symptoms of Stall: Approaching stall, high AOA, low and decreasing airspeed, quietness of airflow, ineffective controls, sloppier controls, sound alarm, buffet.
In stall, noise pitches down, possible wing drop, height lose, ailerons ineffective, wings drop.
In wing drop use rudders to prevent rolling, don’t use ailerons and use opposite rudder to wing dropped.
Boundary
Boundary Layer: Layer of slower moving airflow close to the aerofoil, caused by skin friction.
Laminar airflow, turbulent airflow, transition point is when turbulent airflow occurs, and separation point is when it breaks away it doesn’t help to produce lift.
Speed
Stalling speed: Minimum speed at which an aircraft flying at critical angle will maintain in level flight. Vs = 40 knots, Vs(flap) = 30 knots.
Load factor – pulling stick back, increases as turning degree does. E.G: 60-degree AOB = LF = 2, new Vs = 40 x square root of 2 = 56kts.
Lift Required increase = will require stall speed increase (Vs).
Lift produced increases = Vs decreases.
AFT Centre of gravity: Moving centre of gravity backwards towards tail.
Weight and lift pulls down, drag and thrust lifts barely.
Angle
Critical Angle: AOA at which lift reaches a maximum and beyond which lift decreases is called the critical angle or stalling speed. Stalls happen here.
Centre of pressure is where the lift centre is.
