PPL-Aerodynamics Flashcards
Coefficient of lift is generally determined by
Camber & AoA
What are coupled moments
Interaction of two forces separated by a horizontal distance
Where does the Centre of Pressure reach its forward limit on the wing
At the stalling angle
The tendency in a climb while turning is to
overbank (because outside wing is faster and has > AoA)
Why is there a tendency to underbank in a descent
Increase in AoA on inner wing outweighs effect of outer wing’s greater velocity
What is adverse aileron yaw
tendency for the aircraft to yaw out of the turn as a result of the downward aileron having more induced drag
Describe Frise type Ailerons
Uses offset hinges to deflect part of the upgoing aileron into the air on the underside of the wing (creating more drag)
Describe differential ailerons
The up-going aileron travels further than the down-going aileron
Describe what coupling the ailerons and rudder does
As the aileron moves, the rudder automatically moves to counteract the adverse yaw
What is the equation for load factor
Lift/weight
Define a spin
An aggravated stall with a wing-drop that results in autorotation (corkscrewing around a vertical axis)
What defines a fully developed spin as opposed to an incipient spin
aircraft’s angular rotation rate, airspeed and vertical speed are stabilised
When does a flat spin occur
When the mass of the aircraft is further away from the spin axis
CAS=
IAS+IEC+PEC
EAS=
CAS+CEC
TAS=
EAS corrected for density error
What effect does a higher airspeed have in a turn
Increase radius, decrease rate
At a constant airspeed, the greater the bank angle, the …… the turn
tighter
rate 1 turn=
180 degrees/min (3 dg/s)
bank angle req for rate 1=
10% IAS + 7