POF - Stalling and Spinning

A stalled aerofoil:

• Will have exceeded the critical angle and airflow has separated from the rear section of the wing

• Will not have exceeded the critical angle and the airflow will still be attached to the majority of the wing

• Will have exceeded the critical angle and the airflow will be separated from the majority of the wing

• Will have exceeded the critical angle and the airflow will still be laminar over 90% of the wing

At the stall angle the separation point:

• Moves forwards

• Moves rearwards

• Remains stationary

• Will move to the stagnation point

Describe basic stall speed

• VS1 - The stall speed with no power and no flap

• VS0 - The stall speed with no power and no flap

• VS1 - The stall speed with no power and full flap

• VS0 - The stall speed with full power and no flap

Select all correct symptoms of an approaching stall

• No airspeed

• Reducing control effectiveness

• Buffeting of the controls

• Quieter

• Higher and higher nose attitude

When the stall warning comes on the aircraft is stalled

• True

• False

At the stall the CoP

• Moves to the forward limit. This is because as you increase AoA the CoP moves forwards

• Moves rapidly rearwards

• Remains at the same position that it was in for 16° AoA. Because the aircraft is stalled the CoP cannot continue to move forwards

• Moves in front of the CoG. This is what caused the stall.

At the stall the aircraft will:

• Pitch up because the CoP has moved forward of the CoG causing the couple to reverse

• Pitch down because the CoP has moved forward of the CoG causing the couple to reverse

• Hold a constant AoA because the tailplane is ineffective in a stall

• Pitch down because CoP has moved rearward

Select the options that make up the standard stall recovery

• Stick forwards (to increase the AoA)

• Stick forwards (to decrease the AoA)

• Power (to reduce height loss)

• Rudder (to prevent further yaw)

An increase in aircraft weight will do what to the stall speed?

• Increase stall speed due to the reduced requirement for lift

• Increase stall speed due to the CoP moving past the CoG

• Increase stall speed due to the increased requirement for lift

• Reduce stall speed because the aircraft has more potential energy

Load factor with regards to stall speed:

• Will increase the stall speed by the square of the load factor

• Will decrease the stall speed by the square root of the load factor

• Will increase the stall speed by the square root of the load factor

• Will increase the stall speed by the square of the load factor