| 摘要 |
Weight-adjusted underwater toy having a somewhat lower specific gravity than water, and having its center of gravity located below and somewhat behind the volumetric center of the toy. The toy has a streamlined shape, like a fish, a sea animal, a swimmer, a submarine (5). The model will follow a long glide curve (1) similar to an approximately upside down ballistic path when flung into the water, and it will always rotate into a position with its back up and its abdomen down (1). When rising, the location of the center of gravity will provide an inclined forward/upward position for the model (1), and horizontal side wings (fins or other details) will prevent a purely vertical rising movement by providing a forwardly directed momentum during a buyoancy movement. The weight adjustment takes place either by forming the model from a material which is heavier than water and is divided in two parts along a horizontal center section (2) with an excavation in the top part (2a) behind the center of the section surface, in such a manner that when joining the parts together, a sealed air pocket (3) is formed, or by forming the model from a material which is lighter than water and has a heavier weight imbedded below and somewhat behind its volumetric center.
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