Word: 9a
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Dates: during 1960-1969
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...does away with the heavy knuckles. Even more sophisticated models are on the way. Bell's armor-plated AH-1G next year will give the Army its first helicopter designed as an aerial artillery platform. Hughes, aiming at a future 110-passenger intercity transport, built its experimental XV-9A hot-cycle model, which is powered by hot gases shooting out of rotor-tip vents. Beyond that come bizarre crossbreeds intended to graft the convenience of helicopters to the greater speed and durability of conventional planes. Ling-Temco-Vought's tilt-wing XC-142A can fly straight up, backward...
...speeds of up to 500 m.p.h. Vertol is designing a tilt-winged aircraft that also lifts off as a copter, with its wings in a vertical position, then speeds forward as the wings are tilted horizontally and propellers take over to pull it along. Hughes's experimental XV-9A shoots hot gases out of rotor-tip vents for increased power. The industry has also developed all-weather instruments, automatic stabilizers, rotor blades that function for longer periods, more efficient rotor heads and gearboxes...