by Bob the Builder ?? Fri Jun 23, 2006 3:50 pm Well, I am not and expert by any stretch of the imagination, but I would guess that the fact that the area above the low pressure zone in your model being enclosed in the tube will simply cause severe turbulence and not any sort of lift.Additionally, I am not sure that air-based designs are employable with water, as air is a compressible medium and water is