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THE Nomad compounded diesel engine described in this paper has been developed by Napier during the past seven years. Resulting from the combination of a diesel engine with a gas turbine, the engine gives lower fuel consumptions than can be obtained from any other type of powerplant and maintains these consumptions over a wide range of aircraft speeds and altitudes. These characteristics, which are still further improved by the ability to use cheap fuels, produce an engine making possible extreme economy for air transport purposes and very long-range operations for either military or civil purposes.

RESULTS of a laboratory study of some of the factors causing wear, scuffing, and spalling in passenger-car engines, with emphasis on the lubricating oil variables involved, are reported in this paper, which is part of the Symposium on Cam and Tappet Wear. The tests show that piston-ring and valve-lifter wear and spalling of some valve-lifter materials seem to be greater with low-viscosity oils such as SAE 5W-20 and 10W. Certain antiwear lubricating oil additives reduce valve-lifter and ring wear but may increase spalling of chilled iron lifters. However, using an oil with good antiwear properties for engine break-in will not prevent future lifter wear if the engine is operated with an oil of poor antiwear characteristics.

HEAVY-DUTY rear axles are analyzed in this paper - the first L. Ray Buckendale Lecture to be delivered. The author presents a practical method of evaluating heavy-duty rear axles, with emphasis on performance and axle ratio. The major part of the paper is devoted to a discussion of the four functions of rear axles, as follows: (1) To carry the load, (2) to transmit driving torque, (3) to allow differential action, and (4) to help stop the vehicle.

FORMULAS relating the various factors of an adjustable-speed V-belt drive-speed variation, power transmission, and service life-are presented here for the first time. Use of these formulas eliminates previous trial-and-error methods of variable-speed-drive designing. Following the procedures and data given in this paper, the designer can now calculate a drive knowing that a V-belt of satisfactory quality will give satisfactory service within the limits of certain design assumptions.

DESCRIBED here is a new nickel-base alloy offering a combination of high-temperature strength, adequate ductility, and low strategic alloy content. Used in gas-turbine buckets where extremely high temperatures are encountered, GMR-235 has undergone a program of laboratory testing, development of foundry production and control methods, and extensive field testing with no failures.

Development, performance and description of a unique new centrifugal supercharger which provides large increases in engine power with present-day fuels. The variable speed V-belt drive with pneumatic control provides (1) maximum air pressure over a wide operating range, (2) protection against over-speed and (3) a lower speed economy range. Data is presented on a low cost, quiet, high-speed drive for which very little information had been available. Life testing and performance indicate it to be a desirable means of increasing power and economy in both diesel and gasoline engines without resorting to extreme engine speeds.