Stall Flashcards
Stalling involves loss of ___ and loss of ___
Stalling involves loss of HEIGHT and loss of CONTROL.
A pilot must be able to clearly and unmistakably ___ a stall.
A pilot must be able to clearly and unmistakably identify a stall
A stall is caused by airflow ___
A stall is caused by airflow separation
Separation can occur when either the boundary layer has insufficient ___ energy or the
____ gradient becomes too great.
Separation can occur when either the boundary layer has insufficient KINETIC energy or the
ADVERSE PRESSURE gradient becomes too great.
Adverse pressure gradient increases with increase in ________
Adverse pressure gradient increases with increase in ANGLE OF ATTACK
Alternative names for the angle of attack at which stall occurs are the ___ angle and the
___ angle of attack
Alternative names for the angle of attack at which stall occurs are the STALL angle and the
CRITICAL angle of attack
The coefficient of lift at which a stall occurs is ___
The coefficient of lift at which a stall occurs is C_LMAX.
A stall can occur at any ___ or flight ____
A stall can occur at any airspeed or flight attitude
A typical stalling angle is approximately ___°.
A typical stalling angle is approximately 16°
To recover from a stall the angle of ____ must be ____.
To recover from a stall the angle of ATTACK must be DECREASED.
Maximum power is applied during stall recovery to minimize ______
Maximum power is applied during stall recovery to minimize HEIGHT loss.
On small aircraft, the ____ should be used to prevent wing ____ at the stall
On small aircraft, the RUDDER should be used to prevent wing DROP at the stall
On swept wing aircraft the ___ should be used to prevent wing ___ at the stall.
On swept wing aircraft the AILERONS should be used to prevent wing DROP at the stall.
Recover height lost during stall recovery with moderate ___ pressure on the ___ control.
Recover height lost during stall recovery with moderate BACK pressure on the ELEVATOR control.
The first indications of a stall may be ___ flight controls, ____ device or
aerodynamic ____.
The first indications of a stall may be UNRESPONSIVE flight controls, stall WARNING device or
aerodynamic BUFFET.
At speeds close to the stall, ___ must be used with caution to ___ a dropping wing.
At speeds close to the stall, AILERONS must be used with caution to LIFT a dropping wing.
Acceptable indications of a stall are:
(1) a nose-down pitch that can not be readily arrested.
(2) severe buffeting.
(3) pitch control reaching aft stop and no further increase in pitch attitude occurs
Reference stall speed (VSR ) is a CAS defined by the ____
Reference stall speed (VSR ) is a CAS defined by the AIRCRAFT MANUFACTURER.
An artificial stall warning device can be activated by a ____ switch, an ____ vane
or an ______.
An artificial stall warning device can be activated by a flapper switch, an angle of attack vane
or an angle of attack probe.
A rectangular wing planform will tend to stall at the ___ first.
A rectangular wing planform will tend to stall at the ROOT first.
An aerofoil section with camber near the _____ will stall at a higher angle of attack.
An aerofoil section with camber near the LEADING EDGE will stall at a higher angle of attack.
An aerofoil section with a large thickness-chord ratio will stall at a ___ angle of attack and
will stall more ____.
An aerofoil section with a large thickness-chord ratio will stall at a HIGHER angle of attack and
will stall more GENTLY.
