Word: main
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Dates: during 1960-1969
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...traffic. From South Viet Nam come reconnaissance patrols of Vietnamese, Montagnard and Nung tribesmen, or of U.S. Special Forces led by local guides. Occasionally, when a Communist troop concentration is firmly fixed, South Vietnamese units as large as a company slip across for a swift, unpublicized strike. But the main job of harassment is carried out by the Royal Laotian Air Force's 25-odd prop-driven T-28 fighter-bombers and U.S. jets out of Thailand, which bomb the heavy traffic on the trail around the clock under the euphemism of "armed reconnaissance...
...Colombia some 300 Castroite guerrillas in two main bands roam the countryside. In recent weeks they hijacked a train, killed 15 army troopers in an ambush in mountainous Huila province and shot to death six more in an attack on an army convoy near Chaparral, 115 miles southwest of Bogota...
Actually, there were no "new facts." The Portland Albany route that Cambridge citizens proposed as an alternative was the same in October as it had been in March. The main difference was Volpe's attitude: in March, he was untroubled by the DPW's selection; in October, he was worried...
...only faster and more sophisticated than any helicopter now flying in Viet Nam but is also a long technological hop ahead of anything in the industry. Designated the AH-56A Cheyenne, Lockheed's AAFSS is a "compound" aircraft. Like a conventional helicopter, the single-turbine Cheyenne has a main rotor and tail-mounted stabilizing rotor for hovering and vertical takeoffs and landings. In the air, a simple twist of the control-stick grip sets the pitch of the rear-mounted pusher propeller for 240-m.p.h. cross-country dashes on the craft's stubby wings...
...makers have sacrificed simplicity and speed by using flexible rotor blades mounted on heavy, complex hinges. Lockheed picked up the all-but-forgotten rigid-rotor idea in 1957-and found a way to handle it: the pilot's stick tilts only a small control rotor mounted above the main one. That, in turn, gyroscopically swings the aircraft to any desired attitude almost instantly...