DISCOVERY COAST Powered by two Caterpillar 3512B diesel engines, with Reintjes reduction gears at a ratio of 6:1, with shaft brakes. Turning two Hung Shen propellers, mounted in Rice kort nozzles, with triple vane rudders for a rated 3,000 horsepower. Her electrical service is provided by two Caterpillar diesel generators. The tug’s capacities are 72,000 gallons of fuel oil, and 18,800 gallons of potable water.