After several hours in the confined quarters, I wanted to kick out, to walk, to stretch myself. For Alcock, who never removed his feet from the rudder-bars, the feeling of restiveness must have been painfully uncomfortable.
It was extraordinary that during the sixteen hours of the flight neither Alcock nor I felt the least desire for sleep. During the war, pilots and observers of night-bombing craft, their job completed, often suffered intensely on the homeward journey, from the effort of will necessary to fight the drowsiness induced by relaxed tension and the monotonous, never-varying hum of the motor—and this after only four to six hours of continuous flying.
Probably, however, such tiredness was mostly reaction and mental slackening after the object of their journeys—the bombing of a target—had been achieved. Our own object would not be achieved until we saw Ireland beneath us; and it could not be achieved unless we kept our every faculty concentrated on it all the time. There was therefore no mental reaction during our long period of wakeful flying over the ocean.
We began to think about sunrise and the new day. We had been flying for over ten hours; and the next ten would bring success or failure. We had more than enough petrol to complete the long journey, for Alcock had treated the engines very gently, never running them all out, but varying the power from half to three-quarter throttle. Our course seemed satisfactory, and the idea of failure was concerned only with the chance of engine mishap, such as had befallen Hawker and Grieve, or of something entirely unforeseen.
Something entirely unforeseen did happen. At about sunrise—3:10 A. M. to be exact—when we were between thirty-five hundred and four thousand feet, we ran into a thick bank that projected above the lower layer of cloud. All around was dense, drifting vapor, which cut off from our range of vision even the machine's wing tips and the fore end of the fuselages.
This was entirely unexpected; and, separated suddenly from external guidance, we lost our instinct of balance. The machine, left to its own devices, swung, flew amok, and began to perform circus tricks.
Until we should see either the horizon or the sky or the sea, and thus restore our sense of the horizontal, we could tell only by the instruments what was happening to the Vickers-Vimy. Unless there be outside guidance, the effect on the Augean canal in one's ears of the centrifugal force developed by a turn in a cloud causes a complete loss of dimensional equilibrium, so that one is inclined to think that an aëroplane is level even when it is at a big angle with the horizontal. The horizontal, in fact, seems to be inside the machine.
A glance at the instruments on the dashboard facing us made it obvious that we were not flying level. The air speed crept up to ninety knots, while Alcock was trying to restore equilibrium. He pulled back the control lever; but apparently the air speed meter was jammed, for although the Vickers-Vimy must have nosed upwards, the reading remained at ninety.
And then we stalled—that is to say our speed dropped below the minimum necessary for heavier-than-air flight. The machine hung motionless for a second, after which it heeled over and fell into what was either a spinning nosedive, or a very steep spiral.