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A Kentucky Do-Nothing is toy or novelty consisting, in its simplest form, of a base and a crank and two sliding parts. One sliding part is connected to the crank at the crank's end, the other is connected at the crank's midpoint. When the crank is turned, the sliding parts move back and fourth in grooves cut into the base. Because of the restricting movement of the sliding parts, the free end of the crank (often with a knob) moves in an elliptical pattern.
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from wikipedia:
A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel—the engine of the rocket—is usually a used plastic soft drink bottle. The water is forced out by a pressurized gas, typically compressed air.
The term "aquajet" has been used in parts of Europe in place of the more common "water rocket" and in some places they are also referred to as "bottle rockets" (which can be confusing as this term traditionally refers to a firework in other places).
Water rocket engines are most commonly used to drive model rockets, but have also been used in model boats, cars, and rocket-assisted gliders.
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