Word: suction
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...study aerodynamics. They built themselves a wind tunnel and learned new aerodynamical laws. Two things, they learned, happened to a moving plane-wind" pushed it up from below and a vacuum sucked it up from above. If the plane was slightly curved and tapered from front to back the suction force was about three times the pushing force. They learned, too, how to warp the plane wings, how to steer it, how to control it in all ways. They built their own motor. And then they were ready to make their first flight...
Curious things happen to wings in certain positions, owing to such demoniac conflicts as those of suction on the upper surfaces and pressure on the lower. The adjustment must be delicate or nose-dives and involuntary tailspins result. Slotted areas in the wing, allowing air to pass through, seem to have a kindly, stabilizing effect. Thus aviation's newest safety device is called the wing slot. Technical journals still use "probably" and "theoretically" in referring...
...took off his collar and tie, went to the washroom, vanished. The servants all professed that they felt no such rush of air as would commonly be experienced if the door of the plane, which was opposite the washroom door, had been opened and become a funnel for the suction of the 175 mile gale...
...noise of a suction street-sweeper engaged in nocturnal activity near Harkness Hall provided the incentive for the demonstration. A group of students resented the presence of the machine and attempted to halt its progress. In the ensuing disorder, street-cars were besieged, and their trolleys disconnected. One of the Yale men was speedily arrested and led jail-wards, but this act served only to center the attention of the crowd upon the police officers and a force of rescuers marched in pursuit of the captive. A frontal assault upon the New Haven police headquarters, covered by a brief barrage...
...held idle for emergencies. The fuselage is long and slim, chiefly a strut to hold the tail. But before the actual ship is built, the model must be well tested in a wind tunnel, i. e.-a a stout tunnel built for aviation model tests. So terrific is the suction of the propeller set at one end to furnish air currents, that a man standing in the tunnel would be swept into the whirling blades, instantly killed...