Comment Re:Sheerwind "bladeless" wind generators (Score 1) 164
This Sheerwind Invelox sets off my BS meter as well. The Venturi effect (a special case of the Bernoulli principle) won't magically let you harvest more energy then what was already in the airflow. In a Venturi device, flow velocity increases temporarily in exchange for a pressure drop (to less than atmospheric pressuee). Downstream, the velocity lowers and the kinetic energy exchanged back into pressure, reaching atmospheric pressure. If you were able to harvest the kinetic energy, you would end up with a slow gas velocity and still subatmospheric pressure, which wouldn't be able to flow back into the atmosphere.
This is also worth reading: http://www.gizmag.com/dodgy-wi...