Sports Hydro - By William D. Jackson. Competition-bred, three point hull designs featuring high efficiency, smart appearance, and relatively simple lines are a good first choice for boat builders who want fast sports boats with maximum economy. Beyond the initial cash saving gained by building the boat yourself, there's the added economy of being able to use stock 40 to 50-hp outboard engines to attain speeds of 50 mph as the original model did driven by a stock 45hp Mercury outboard engine.