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MOLECULAR weight or volatility has been found to be the most important factor in determining the extent to which a lubricant contributes to combustion-chamber deposits and octane requirement. Bright stock appears to be particularly harmful. Crude source (or variation in predominating hydrocarbon type) seems to have little effect. These authors report further that commercially practical mineral-base oils have been developed that show a significant advantage over previously known conventional lubricants in their ability to prevent these deposits and octane requirement increase when used with a conventional leaded fuel. Moreover, they say that SAE 5W-20 motor oils can be made that give a 4-5-octane advantage over conventional motor oils in preventing detonation. They point out, further, that, although progress has been made, even better lubricants and fuels are needed, in this respect.

A NEW procedure for explosion testing of aircraft equipment is such that the effects of mixture ratio, ignition location, and temperature are now reflected in the test results. The investigation of the effects of these items on flame suppression, which prompted adoption of the new test procedure, is described in this paper.

This paper presents one writer’s viewpoint on some of the many tractor design considerations that must be recognized when incorporating one of the following types of hitches: Front and rear integral hitch, towed implement hitch, and rear integral hitch.

THIS review of early developments in automotive equipment and its lubrication requirements was presented by Mr. Mougey upon the occasion of his retirement from General Motors. He covers such subjects as crankcase oil specifications, crankcase dilution and corrosion, oil consumption, break-in oils, e-p crankcase oils, hydraulic valve lifters, relation of oils to octane requirement increase in engines, and hypoid-gear rear-axle lubricants - discussing what progress has been made and what problems are still to be solved. He also pays tribute to a few of the many individuals who contributed to the progress that has been made in automotive lubrication. He points out that there are many other subjects on which progress has been made, but that he couldn’t cover them all in one short paper.

It is not the purpose of this report to dwell extensively on the physical properties of the subject material. But, rather with the steel defects that are a vital factor from the stand-point of efficiency and economy to both the producer and user of sheet steel. It is fitting therefore, that these factors be delt with extensively at this time.

AN analysis of jet engine noise as a function of jet engine design characteristics is presented in this paper along with some thoughts as to possible means for reducing the noise of jet transports for the future. The authors present a summary of (a) scale-model noise work, (b) full-scale jet engine noise measurements in test cells and free field, and (c) a discussion of information gleaned from comparisons of scale-model work with full-scale engine work. This paper received the Wright Brothers Medal for 1954.