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The bow of the hydroplane has a knife-like cutting edge and a peculiar flare which, under speed, brings the bow up out of the water. The bottom is flat and wide and from near the bow to the stern at regular intervals are notches or steps, like the teeth of a saw pointed backward. Under speed aid Is drawn under the boat by these steps and the boat has a continual tendency to leap out of the water. The result Is that when speed Is attained the hydroplane Is skimming over the surface of the water, scarcely touching it at all excepting for the stern. There is very little resistance, and powerful motors running at high speed are, therefore, able to push this style of boat over the water at a terrific speed.
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