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The pendulum A swings from the frame B of the machine, the ailerons a being in this case also shown at right angles to their true positions.
In the operation of his ailerons, combined with the use of his elevator, a pilot is given means to balance his craft while in flight. One should not gain the impression that an aeroplane is threatening ceaselessly to heel this way and that. This is not so.
Desperately her driver strove with levers and guiding wheel. But his efforts were of no more avail than if he had idly surrendered to disaster. Like a stricken bird the Buzzard dropped downward. All her occupant could do was to check the awful speed of her fall by spreading his ailerons to their fullest extent.
McGee walked over to Yancey's plane. The gangling Texan was testing his rudder controls and flipping his ailerons with jerky movements of evident impatience. "I want you to know," McGee said to him, "that I did not ask for this flight. It is yours, by rights." Yancey's grin was genuinely friendly. "Shucks, that's nothin'. I'm glad to be out. Bein' a flight leader sorter cramped my style anyhow.
As they emerged and struck the wind again, the plane slipped dangerously, but Bill warped the planes and set the ailerons with all the speed he could, and presently the indicator before him registered an even keel and the danger past. Silently Ernest reached over and patted Bill's shoulder. Bill scarcely noticed. He was no longer afraid, no longer nervous.
In this fashion they ran for fifteen or twenty miles on a perfectly even keel, the apparatus automatically working the elevators and ailerons of the craft as various wind currents tended to disturb its equilibrium. At length, John gave a little twist to the rudder, and the way the Sky-Bird began to circle, and to bank of her own accord, was a splendid sight to behold.
The lower end of the stem is mounted in a socket, at D, so that while it may be turned, it will also permit this oscillating motion. Near its lower end is a cross bar E from which the wires run to the vertical control plane, and also to the ailerons, if the machine is equipped with them, or to the warping ends of the planes. Steering and Control Wheel.
With left aileron down, the lift of the left wing is increased, and it tips up; at the same time the lift of the right wing is decreased, and it sags down. In that way the airplane is tipped up for a bank. These ailerons, wing sections, really, are controlled by a device known as the joy-stick in the cockpit. We have seen how an airplane is made to tip and turn.
At the rear extremities of the main-planes as illustrated in the photograph facing page 34 and marked D.D. are flaps, or ailerons, which are hinged so that they may be either raised or lowered. These ailerons are operated, through the medium of wires, by the same hand-lever which governs the movement of the elevator.
He looked at and tested the tension of the wires, the swing of the rudder, the looseness of the ailerons. Satisfied at last that everything was perfectly in tune, he turned and gave a critical glance at Frank. "He is going to freeze," he said. "You go up to the gym and in my locker you will find another coat and safety helmet." Bill started on a run.
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