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PASSENGER-CAR styling considerations demand a low silhouette. The drive line must be lowered to provide reduced height. Several possible configurations could be used to achieve this, but each is limited by the excitation which can be absorbed without objectionable disturbances. These effects are explored in so far as they vary with drive-line revisions and practical limits established. This permits comparison of possible drive-line arrangements as they affect lowering of the car.

A turbine engine powered vehicle requires a power transmission system with distinct differences over one required with other powerplants. The power transmission components can be modified to accommodate the new requirements. As turbine engines become more popular a more optimum approach to power transmissions is needed. Some reasonable possibilities are discussed. The manner in which components have been applied and the results obtained along with future possibilities are covered in the area of clutches, mechanical transmissions, and drivelines and axles.

THE INCREASED use of midship-mounted transmissions in large equipment has emphasized the need for a torsionally resilient connection from the engine to reduce vibration transfer. To increase the torsional flexibility needed in these systems, the spring rate of the system must be reduced by such constructions as a flexible coupling, a spring-loaded damper, or a rubber torsional spring. This paper discusses these systems, emphasizing rubber springs. Some advantages of such a drive are: it provides an amplitude limitation with impact loads and a cushion to reduce noise and prevent clattering and contacts noises on parts with backlash, it smooths out transition periods to reduce loads on bearings and gears, its clamping characteristics can be adjusted by various rubbers, and its rubber cushion provides a degree axial flexibility.*