4.17
Stalling.
During test flying of the UK prototype G-CBIV the following stalling speeds
were recorded:
VS1 – Stalling speed at max takeoff weight, forward CG and flaps up: 36kn CAS.
VSO – Stalling speed at max takeoff weight, forward CG, full flap: 33kn CAS.
These speeds should represent the worse case in normal service. Lower
takeoff weights and more rearward CG will lower the stalling speed – but not
by much! Pilots should also remember that stalling speed increases during
turns and manoeuvres. Any ice on the aircraft will also increase stalling speeds
–
never takeoff with ice present on the aircraft.
4.17.1
Slow flight characteristics
Slow flight indications include:
•
Lightening of controls accompanied by reduced effectiveness
•
Reduced airflow noise (most noticeable at low power settings)
•
High nose attitude (most noticeable at high power settings)
•
Rearwards position of control stick and back pressure
•
Strong pitch buffet as the incipient stall is entered
•
A tendency to roll or wing rock accompanying the buffet
To recover normal operating airspeed at the slow flight stage, simply move
the stick forwards and apply power.
4.17.2
Wings Level, Power Off.
The aircraft can safely be stalled at a
deceleration rate of up to 3kn/s. Max pitch attitude is 45
0
, and stall warning is
given about 5 knots above the stall by buffet. Stall is normally marked by a
mushing descent in heavy buffet or nose drop.
4.17.3
Recovery
is effected in the standard manner by moving the stick forwards
to reduce angle of attack and simultaneously applying full power. The nose
can then be raised as soon as the airspeed is building past 45 – 50 knots CAS
[ IAS]. Height loss between stall and recovery, if well executed, is
around 50 feet ft if power is used, or around 100 feet to establish a steady
glide if power is not used.
Skyranger Operators Manual, Issue 1, AL0, June 2002
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