Consider the following statements regarding three controls for an
Consider the following statements regarding three controls for an aircraft as shown in figure:
1) Aileron controls the movement of aircraft about longitudinal axis (rolling).
2) Elevator at the rear end of fuselage control the pitching (up and down) movement of aircraft.
3) Redder control the movement about z-axis (yawning).
The correct statements are:
A. 1 only
B. 2 only
C. 1 and 3 only
D. 1, 2 and 3
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
All statements are correct.
Three controls: An aircraft in space can move in three principal axes, namely X – axis, Y – axis and Z – axis, as shown in figure.
The movement of aircraft about the X – axis is called the lateral or rolling movement. This axis passes through the centre – line of nose and tail of the aircraft. A hinged flap, known as aileron, is fixed in the trailing edge of wing near the wing tip to serve as control of the aircraft along X – axis or longitudinal axis. The aileron is rigged in such a way that when in one wing is pulled up, that in other wing is pulled down. The net effect of doing these operations simultaneously is to give a very powerful rolling control to the aircraft about its X-axis. The function of aileron is to enable the pilot to balance the aeroplane when it is tilted by a gust of wing. It also permits to tilt the machine purposely, say when the aeroplane is describing a circle and it is desired to tilt it laterally.
The movement of aircraft about the Y-axis is called the pitching. This axis passes through the centre-line of wings and it is perpendicular to the X-axis. The elevator in the form of two flaps is provided at the extreme rear end of fuselage to control the pitching or up and down movements of the aircraft. The elevator is capable of moving up and down through an angle of 50° to 60°. The flaps of elevator are hinged to a fixed horizontal surface known as stabilizer or tail plane. When the elevator flap is raised, there is increased air pressure on it which results in tail to go down and nose to point up. When the air pressures are equal at the top and bottom of the flaps, the elevator is in a neutral position and the aircraft files along the normal line of flight.
The movement of aircraft about the Z-axis is called the Yawing. This axis passes at right angles through the meeting point of X-axis and Y-axis. The turning or yawing movement of the aircraft to the right or left of the vertical axis through an angle of about 30° is achieved by the rudder which consist of a stream-lined flap hinged to a vertical axis at the tail end of the fuselage. The rudder makes it possible to steer the aeroplane in the air along Z-axis.
