Flight Controls Flashcards
what is rotation around the lateral axis known as?
pitch
what is rotation around the longitudinal axis known as?
roll
what is rotation around the vertical/normal axis known as?
yaw
what motion does the elevator control?
pitch
what motion do the ailerons control?
roll
what motion does the rudder control?
yaw
what are the two types of elevators?
normal and all-moving tailplane
what is the secondary effect of roll?
yaw
what is the secondary effect of yaw?
roll
to roll to the left, the left aileron goes (up/down) and the right aileron goes (up/down)
up, down
roll - (slip/skid) - yaw
slip
yaw - (slip/skid) - roll
skid
what is a differential aileron?
an type of aileron which where the up aileron rises more than the down aileron drops, reducing the difference in drag
what is a frise-type aileron?
an aileron which drops the front edge of the up aileron in order to balance the generation of drag
slipstream rotates (clockwise/anticlockwise)
clockwise
slipstream results in the nose yawing (left/right)
left
what is a canard configuration?
a control configuration where the horizontal stabiliser is in front of the wings
what is a vee (butterfly) tail?
a control surface which combines the elevator and rudder
what are elevons?
a control surface which combines the elevator and the ailerons
what are tailerons?
elevons but on the tailplane
what is a trim tab?
a tab that usually opposes the elevator (occasionally on more advanced aircraft also ailerons and rudders) to relieve the pilots of an excess of stick feel
why are inset hinges used?
to move the CoP closer to the hinge line, lessening the stick feel
what is are the types of horn balance? why are they used?
unshielded and shielded horns are used to reduce the distant between the CoP and the hinge line, decreasing stick feel
a balance tab goes in the (same/opposite) direction of the control surface, which automatically moves with the control surface in order to (aid/lessen) its motion
opposite, aid
what is flutter?
a high speed vibration or oscillation of a control surface which can severely damage the aircraft
what is flexural flutter?
when the control surface lags behind the motion of an aerofoil, which increases wing flex when hit by gusts of wins
what is tortional flutter?
when the wing twists around its lateral axis. occurs more heavily on the control surface than on the aerofoil
mass balancing is placing a ___ on the control surface, moving the CoG (closer to/further from) the hinge line, to reduce flutter
weight, closer
