Suddenly the officer twitched a brass contrivance attached to a quadrant on his steering handle, which was not unlike that of an automobile. He pressed a pedal with his foot and a mighty roar and vibration began at once as the motor opened up.
The acrid reek of castor oil, which is used to lubricate aeroplanes, filled the air. The stuff was expelled from the cylinder vents in blue clouds, shot with lambent smoky flame. The mighty power exerted by the eight cylinders shook the frail fabric of the aeroplane as an earthquake might.
"Hold on tight now!" shouted the officer to the pupils, who were gripping the machine tightly, grasping on to the rear structure. Had they not done so, it would have darted off at once before the two propellers gained top speed and driving power.
"Now!" shouted the officer suddenly.
Instantly they let go, as they had been instructed. Ned felt as if he had suddenly been plunged into a runaway express train that was careening over a newly ploughed field. The shocks and vibration of the machine, as it rushed straight forward, like a scared jackrabbit, over the uneven surface of the field, made it hard to hold on.
Just as Ned felt that he must inevitably be hurled from his seat, the motion suddenly changed. The contrast was violent. From the jouncing, rattling, bumping onrush of a second before, the novice seemed to have been suddenly transported to the softest of feather-beds. The aeroplane glided upward without any apparent effort. It appeared to Ned as if the land was dropping from under his feet, rather than that they were rising from the earth.
Higher they soared and higher. Suddenly their pleasant drifting, as it seemed, though the aeroplane was making sixty miles an hour, changed to a terrifying drop.
It was like rushing downward in a runaway elevator. Ned choked, caught his breath, and turned faint and dizzy. Without wishing to do so, he found himself compelled to close his eyes. The qualms of incipient nausea began to rack him. His head pained, too.
"Gracious," he thought impatiently, "what's the matter with me, anyway? Am I a baby or a girl? If the lieutenant can stand it, I can."
With a supreme effort of will, the Dreadnought Boy compelled himself to open his eyes. He stole a side glance at his companion. Lieutenant De Frees was as cool as an iceberg.