Word: solids
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Dates: during 1950-1959
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...whole, the Army has handled whatever schooling given the RFA's with a high degree of competence. They receive the same training as their classmates, and their classmates, and their instructors generally have a solid knowledge of their subject matter. Most RFA's to whom I spoke said the time spent in schools was the most valuable part of their six months training. Schools which require long periods of atendance are generally not available. Of course, a shortened basic training might allow more men into these highly specialized--and hard to fill--fields...
...Solid-fuel rockets are the dream weapons of military rocketeers. They have no pumps or valves to go wrong and are always ready to fire. Their big trouble is that they are harder to control than liquid-fuel rockets, whose small combustion chambers, fed by flexible pipes, can be mounted on gimbals. When a liquid-fuel rocket takes off, it can switch its gas jet from side to side, correcting any tendency to veer off course. But solid-fuel rockets have no separate combustion chamber, only a nozzle to form the gases into a high-speed jet. Usually the nozzle...
This week, at the New York meeting of the Institute of Aeronautical Sciences, Engineer Harold W. Ritchey of Thiokol Chemical Corp. explained some of the tricks that are used to make solid rockets behave. One method, he said, is to put vanes in the gas jet. When their angles are changed, they deflect the stream of gas like a rudder. This system was used on the German wartime V2, but the vanes add a lot of drag, and they must be made of highly heat-resistant material if they are to last even the few minutes needed to do their...
...guidance and control purposes, solid-fuel rockets are normally loaded with fuel to full capacity. Thus when one of them is fired at a target short of the maximum range, something must be done to cut off or slow the thrust when the rocket reaches the necessary speed. The flow of liquid fuels can be controlled by valves or pumps. Comparable control can be achieved with solids, said Ritchey, by opening small apertures upstream from the nozzle. The gas that leaks out through them reduces the pressure in the combustion chamber, and the thrust falls...
...lack of real hope for future improvement, there was general agreement that even on the road the theater could be counted on to keep dying for a long time. The only solid way to fix stix is through clix. Said Warren Caro, executive director of Theatre Guild-American Theater: "Basically, it all goes back to Broadway. The road's ups and downs reflect the strength of the New York season. If New York offers good and popular plays, the road doesn't have to worry...