Flight Mechanics Flashcards
what pitch does lift/ weight couple create?
nose down pitch
what pitch does thrust / drag couple create?
nose pitch up
what is the flight path angle between?
the flight path, or speed vector and the horizontal
what is angle of incidence?
angle between wing chord and the longitudinal axis
pitch angle is?
the angle between the longitdinal axis and the horizontal
thrust required equation?
T = D + W sin(climb angle)
Lift in a climb equation
L = W cos y
in a steady climb which is greater lift or weight?
in a steady climb lift is greater than weight
climb gradient equation with L/D ratio
T/W - 1 / (LD ratio)
when does best glide range occur?
it occurs at maximum glide angle or VMD or maximum lift to drag ratio.
where is glide angle measured from?
the horizontal and is measured downwards.
what happens to glide angle and ROD with an increase in speed?
ROD will increase and Glide angle will also increase.
what happens to glide angle with tailwind?
glide angle decreases
what happens to glide angle with headwind?
glide angle increases
what happens to glide distance when flaps are extended and why?
when flaps are extended the lift to drag ratio decreases due to sharp increase in drag. as a result, the nose will fall and the glide angle will increase
radius of a turn =
v^2/ g tan x
define a slipping turn to the right.
the aircrafts nose is pointed outwards (left) .
the indicator would b on the far right as there is too much bank.
define a skidding turn to the right.
think more of a drift, nose is pointed to far into the turn.
will occur when there is too much yaw
rate of turn equation?
= G tan X / V
what happens to rudder control input when a critical engine fails?
= this must be increased to produce the same effect.
how is critical engine determined in a clockwise rotating propeller twin?
the centre of thrust for each engine is slightly offset to the right of each engine, this means that one moment force is slightly bigger than the other and therefore is considered more critical.
define asymmetric blade effect? p factor
at pitched attitude, one part of the propeller will have a higher angle of attack than the other, creating more lift which is translated into a yaw reaction.
what is VMCA and how is it determined?
minimum control speed of a/c in air in takeoff configuration.
determined by within 20 degrees heading change, no more 5 degree bank
define vmcl?
minimum control in landing configuration
maintains control within the landing configuration.
