Word: rotors
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...straight up, to hover motionless in midair, to fly sideways, backward and forward, to feel its way through fog or snow at five miles an hour if necessary, to stop quicker than an automobile, and to lower itself vertically into clearings hardly bigger than the circle described by its rotor blades?began proving itself a priceless beast of aerial burden in the early days of the Korean war. In the last 36 months it has altered the whole world's concepts of transport, and has made itself a unique, irreplaceable and increasingly commonplace part of U.S. life...
...helicopters in the world (virtually all U.S.-built) and, in many ways, the inspired contraption is still in its infancy. But few machines have so caught the national imagination. The Marine Corps has long since adopted the helicopter as its answer to the atomic bomb, and proposes to send rotor-topped whirlybirds hurrying inland from carriers far at sea, to establish the beachheads of the future. The Army has begun supplementing trucks with helicopters, and, in so doing, is regaining a disregard for rough terrain it has not been able to afford since the day of the mule. And today...
...level of 200 feet, the engine stopped dead. Obedient to the untested theory they had been taught, and against all their natural instincts, the two tilted the copter downward and dived it at full speed straight for the ground. It worked: 20 feet from the ground the rotor blades, spun by the dive, acquired enough lift to break the fall. The craft smashed up, but Harman and his friend walked away, "just as the fire engines and ambulances came roaring...
...promising field of powder metallurgy is rapidly enlarging its horizons: jet rotor blades of exceptional hardness and heat resistance are now being made at of powdered titanium carbide and a metallic binder fused under tremendous heat and pressure. The big unsolved problem is cost: an incredible $30,000 per ton v. $780 to $1,020 for stainless steel. But as Wilson's program expands production, nobody doubts that U.S. ingenuity and research will whittle down the cost, just as magnesium's cost has been whittled from $5 in 1915 to 27? a pound in 1953. In that prospect...
...instrumentation techniques. Probably the most unique among these is the hot wire aenomometer, a device which measures the velocity of an air stream by measuring the cooling effect of the stream on a hot wire. With this instrument, the phenomenon called rotating stall, where the air flow across a rotor blade is destroyed, was first discovered here...