Schauberger
In order to counter these opposing views practically, test pipes 64 metres long with an internal diameter of 27.5 cm (11 inches) were fabricated. At a gradient of 1%, ore and pebbles with a grain-size of about 10 cm (4 inches) in cross-section were transported down the pipe. The experiments were carried out at Kohlleben. The steeper the geological gradient was, the more efficacious the transport. [The Energy Evolution - Harnessing Free Energy from Nature, The Transport of Ore in Double-Spiral-Flow Pipes]

See Also

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double-spiral pipe
organ pipe
pipe
pipeline
pressure walls
Report Concerning the Preliminary Investigation of Helicoid Pipes with Various Shapes of Pipe-Wall
spiral whorl-pipe
The Transport of Ore in Double-Spiral-Flow Pipes
wall
wall pressure
wall-pressure
whorl-pipe