Maneuvering Flight (SS&C-10) Flashcards
When the aircraft is in a pull-up or level turn, there is a change in rotation about the ____ axis. This creates a change in ______ on the horizontal tail, proportional to the _______.
Y
Angle of attack
Pitch rate (q)
The change in angle of attack on the tail due to a pitch rate tends to create a moment that ______. This is referred to as _____.
Opposes the pitch rate, and acts as a restoring moment on the aircraft.
Pitch damping
What must be done to overcome pitch damping?
Additional elevator is required.
True or False
The gradient of the elevator angle per “G” is one of the criteria for judging the stability and control characteristics of the aircraft in maneuvering or accelerated flight.
True
The gradient of the elevator angle per “g” is a ____ function of __________.
Linear
Stick-fixed stability
When the aircraft is balanced at its stick fixed neutral point, the ________ gradient is only a function of the aircraft ________.
Elevator deflection per “g” (dd_e/dn)
Damping
The stick fixed maneuver point is ____ of the stick fixed neutral point. The difference is greatest at _______.
Aft.
Sea level and for light wing loadings.
The elevator deflection gradient is inversely proportional to _________.
The aircraft’s velocity.
More elevator is required in _____ than in ____ for the same acceleration but at higher _____ the difference begins to vanish.
Steady turns
pull-ups
g’s
The stick force gradient has been shown to vary with ____ position
c.g.
The elevator gradient will be _____ at a more forward c.g. position, and lighter as the c.g. moves ___.
Heavier
Aft
The position of the c.g. at which the stick force/g gradient vanishes is referred to as the _______
Stick-free or stick fixed maneuver point.
Note: It depends on whether your are looking at stick-fixed, or stick-free analysis.
True or false
Flying the aircraft with the CG aft of the stick-free maneuver point is dangerous.
True
Why is flying the aircraft with the CG aft of the stick-free maneuver point dangerous?
Because the stick force/g gradient is very light. This implies a very slight movement can cause rapid accelerations and loss of control.
What are the consequences of the stick force/g gradient being too high or too low with respect to a pilot?
If the gradient is too high the pilot becomes fatigued. If the gradient is too low the aircraft is too hard to control and the pilot becomes exhausted.
