Chapter 1.2 - Exam Review Flashcards
What effect does moving the CG forward have on the Longitudinal Stability of an Aircraft?
Longitudinal Stability is increased.
What factor has the most influence on Longitudinal Stability (Horizontal/Vertical) Stabiliser?
Horizontal Stabiliser.
If the CG is moved aft, what effect does this have on the Longitudinal Stability of an Aircraft?
Longitudinal Stability is reduced.
When the Centre of Pressure moves forward as the Angle of Attack is increased in low speeds, what effect does this have on Longitudinal Stability?
Reduces Longitudinal Stability.
When engine power (thrust) is increased at low Airspeed (high Angle of Attack), what effect does this have on Longitudinal Stability of a conventional light Aircraft?
Reduces Longitudinal Stability.
If the CG is moved forward of its forward limit, what effect does this have on control?
The Elevators become less effective.
Strong Directional Stability and weak Lateral Stability are characteristics of what?
Spiral Instability.
True or False. Elevator balance tabs are used to automatically adjust the control forces that the Pilot must exert?
True.
Control surfaces must be ‘mass balanced’ to ensure the Centre of Gravity is ahead of the hinge line. What is the reason for this?
To prevent severe vibration.
Trailing Edge control surfaces attached to the Elevators, Rudder or Ailerons are called Trim Tabs. Are Trim Tabs automatically adjusted like balance tabs or are they only adjustable from the Cockpit?
Only adjustable from the Cockpit.
In Aircrafts with clockwise-rotating propellers (as viewed from the cockpit), propeller slipstream effect during Takeoff and Climb will cause the nose of the Aircraft to yaw to the (right/left)?
Left.
Propeller torque effect also causes a yaw to the left. When is this effect most pronounced?
On Takeoff.
If an Aircraft is in ground effect, what are the two main aerodynamic factors it will experience?
- Increase in Lift.
- Reduction in Drag.
Just after lift-off as an Aircraft Climbs out of ground effect, it will be subjected to an (increase/decrease) in induced drag?
Increase.
To maintain a constant IAS in Straight and Level flight, any reduction in weight means the lift must be (decreased/increased)?
Decreased.
How can lift be decreased in Straight and Level flight if the IAS remains constant?
By using a lower Angle of Attack.
Given a constant Altitude and Angle of Attack, any reduction in weight must be accompanied by an (increase/decrease) in IAS to maintain level flight?
Decrease.
Do changes in Altitude have any effect on the Angle of Attack/Airspeed relationship in level flight?
No.
The speed for maximum still air range is (greater than/less than/the same as) the speed for minimum drag?
The same as.
Give the main reason for flying for maximum still air range?
To fly the greatest distance for the least amount of fuel.
Give a reason for flying for maximum endurance?
To stay in the air for as long as possible for a given amount of fuel.
An increase in weight (increases/reduces) the maximum range obtainable?
Reduces.
When flying for maximum range, an increase in weight means that the IAS will need to be (increased/decreased) so that it corresponds to the speed for maximum lift/drag?
Increased.
Power is set to achieve the required Airspeed when flying for maximum range in a piston-engine Aircraft fitted with a fixed-pitch propeller. This power is only obtained efficiently with (lean/rich) mixture and the carburettor heat control in (hot/cold)?
- Lean.
- Cold.
