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in these, the fluid coupling is a link between the engine and the drive shaft. it still requires a geared transmission, either manual or automatic, a drive shaft, and a rear axle. the gadabout simplified this system by applying the hydraulic pressure directly to the wheels.
the idea of a full hydraulic drive was not new, in 1945. past efforts to develop the principle however, had never passed the experimental stage. detroit engineer and industrial designer, ray russell, took the principle of a pump and remote motors from experimental models to the road.
with three pumps of different capacity connected to the engine shaft, seven forward and reverse speeds are possible. by engaging four pumps, 15 different speeds or ratios could be obtained. all pumps would turn with the engine. only those required to operate in the hydraulic system were cut into the system by their feed valves. a pump that is temporarily cut out of the system by closure of this intake valve absorbed negligible power and therefore was not a drag on the engine. the basic valve actions and pipe circuits required to control the hydraulic system were not complicated.
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