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A variation of the yaw string is the side string, used in gliders for a determination of the angle of attack. In this way the speed for best glide angle, the best thermalling speed and the stall speed can be observed independently of other parameters like air speed, aircraft weight, acceleration due to turning, stick movements, and gusts. [18]
The ball's movement is caused by the force of gravity and the aircraft's centripetal acceleration. When the ball is centered in the middle of the tube, the aircraft is said to be in coordinated flight. If the ball is on the inside (wing down side) of a turn, the aircraft is slipping.
The cartwheel portion of the hammerhead is performed with full rudder and full opposite aileron. Gyroscopic forces from the propeller during the rapid rate of yaw will produce a pitching and rolling moment and a degree of forward stick will be required to keep the aeroplane from coming off-line over the top.
An airplane has three axes of rotation: Pitch – in which the nose of the airplane moves up or down. This is typically controlled by the elevator at the rear of the airplane. Yaw – in which the nose of the airplane moves left or right. This is typically controlled by the rudder at the rear of the airplane.
The position of the ball compared to the datum lights indicated the aircraft's position in relation to the desired glidepath: if the ball was above the datum, the plane was high; below the datum, the plane was low; between the datum, the plane was on glidepath. The gyro stabilisation compensated for much of the movement of the flight deck due ...
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The pilot then applies full aileron, accomplished by moving the stick to either the right or left. As the aircraft rolls about its longitudinal axis, the nose will begin to drop. Upon completing the roll, the nose will usually be 10 to 30 degrees below the horizon, so the pilot will need to pitch-up to return to level flight. [3]
It took five years for the ZAZ trio to get Airplane!off the ground, and during that time all kinds of actors were considered for crew and passenger positions aboard the doomed aircraft.