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A STUDY of various stopping methods indicated, it is explained, that reverse thrust would have to be developed for jet engines if jet transports are to have satisfactory operational flexibility. Requirements for reverse thrust are, therefore, discussed in this paper. Primary reverser-design objectives are inherent safety and reliability, stopping comparable to present-day equipment, lack of effect on engine operation, and need for ground-run control only. The author shows that a jet transport using reverse thrust has a stopping distance on smooth ice consistent with a dry-runway brakes-alone stop. The effects of reverser malfunctions on air-plane flying characteristics are compared to the effects of reversible-propeller malfunctions.

THE efforts of one manufacturer to solve the problem of jet-engine noise suppression when test facilities are near residential communities are reported here. The authors describe the construction of several suppressors and give data on their effectiveness. Their experience covers a run-up suppressor and also a portable unit of the water-injector type-both developed for the B-52 airplane, and a water-spray muffler for ramjet engines. They emphasize the fact that, since World War II, airplane manufacturers have been required to spend more and more time, effort, and money in attempts to cut down the noise produced by airplane and guided missile powerplants. The efforts of their company, they point out, are similar to those of other airplane companies. It appears that the problem is growing. No simple solution is yet in sight.