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Updated: May 4, 2025
On certain early-type biplanes, for instance, machines with large tail-planes, and engined as a rule by a motor which was giving less than its proper amount of power, it was most dangerous for a pilot if, on observing any signs of failing in his engine, he sought to fly on in the hope that the motor would "pick up" again, and continue its work.
If he does not do this, and should the motor stop before he has his biplane at an angle for descent, the machine may lose speed so quickly, and its tail-planes show such a tendency to droop owing to the lessening of pressure on their surfaces, consequent upon the failure of the motor that there is a risk of the craft coming to a standstill in the air and then either falling tail-first, or beginning a side-slip that may bring it crashing to the ground.
Unless this is done, and if the machine is, say, at its normal horizontal angle when the engine is stopped, the sudden removal of pressure from the tail-planes of the craft, brought about by the absence of the wind-draught from the propeller, may cause the tail so to droop as to render inoperative any subsequent action of the elevator.
But the other, which was white-checked, lit on our machine and would not budge until Moore threw our navigation clock at him, which probably upset him so that he failed us. "Heavy seas smashed our tail-planes, which kept settling. I saw that they were pulling the machine down by the rear, turning her over. We tore the tail-fabric to lessen the impact of the waves. It wasn't any use.
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