21 WaterDiscs

These 21 water discs aren't entirely of my invention (linky).

But, while we're talking about these 21 discs, the idea of what they do was invented by me.

What these discs do is locate a radio tag on your belt and propel in orbits around you of varying proportions by controlling three lead balls in their chamber. The orbiting ball spins around a chamber in the outer rim, creating a gyro. The center balls will be maneuvered on a slide by a miniconveyer system, and directed by a control system to translate back and forth and manipulate the disc's path to return to the user.

The control system will receive input from both the radio tag, a pressure sensor on the outside rubber ring and a compass to manipulate a 2 dimentional model of the thrower's location and the discs's speed, direction and location. The output of this control will be a movement of the center balls along two of the dics's diameters, both at +45 and -45 deg to the disc's directional axis. This will steer the gyro ever so slightly around a loop.

you start with one waterdisc in your hand. you press a button that both centers the center balls and kickstarts the orbiting ball. At this juncture, the disc should be perfectly horizontal. You can now let go of the disc and it will hover in the water for a minute. You take quite a large metal rod and thrust it into the disc (with the thrusting arm out of the water). This is a little intuitive at this part, but I think this will get the disc sailing off in a pretty good arc, directed by the center balls and the orbiting ball control mechanism.

Take the next disc out and repeat.

If you can keep 21 discs in orbit, you're awesome. If you can make the orbits look all fractal like, you're pretty much genius. If you can clear out overgrowth with the method, you're employed.