The bizarre craft above, behaving more like an outsize water spider than an honest sailboat, is being used in a Navy research project on hydrofoils being carried out by the Baker Manufacturing Co. of Evansville, Wis. The foils, operating on the same lift principle as an airplane wing, hike the hull out of the water at 12 mph, reducing resistance and allowing the boat to reach the incredible sailing speed of 30 mph. Hydrofoils give sailors another great advantage: they never have to bail. "We have a hole in the bottom," says one of Baker's engineers. "When we get up on the foils, we just pull out the cork."
Rear foil acts as rudder, holds down the stern so that boat will not nose-dive.