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I am looking for a small inexpensive example of a rotary pump for a 4th grade science project.
[We watched] a Science Channel special on how a village in a desert area of Africa is moving water from a underground source to their village. The village has set up a merry-go-round, the children playing, spinning the merry-go-round raise the water from the underground source. The water is stored in a storage tank and the people use it as needed. It is basically a Rotary Pump and the children supply the power. Once the children get tired, wind or solar power could be used to operate the pump.
We could use a bank of solar cells to show the Sun's energy at work. We could also hook up a venturi chamber to an electric fan, to simulate using the energy of the wind.
I am looking for a small science fair size Rotary Pump.