A variable speed fluid coupling was submitted for determination of performance characteristics. This fluid coupling was proposed for driving the fan of a cooling system for the power plant of the Main Battle Tank. The fluid coupling was provided with a hydraulic control to vary the fan speed from idle to maximum at a minimum engine oil pressure of 15 psig. Maximum output speed varied with input speed and output load. The hydraulic control was activated by a temperature sensing assembly. An electrically operated control was provided to stop the fan during deep water fording. The fluid coupling was tested to determine output horsepower and torque characteristics, speed loss (percent slip) driving a fan at simulated loads, response of fording and temperature controls, and endurance for 100 hours.

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