Originally posted by AirDOGGe
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No, I will want to go around. It just so it looks at first glance.
Why not? Sent because the in narovest place occurs during movement of vacuum that will suck the wind to the venturi tube. Of course condition is laminar flow through the cones, tubes, or do not occur turbolent. It's a little like an airplane wing. If there is no laminar flow, the lift force disappears and the plane falls. Here, too, will disappear if the laminar flow venturi tube, not give us a profit on what we expect. To maintain the flow laminar, cones are not allowed to have larger angles than those resulting from the calculation. Therefore, they must have adequate length, the relatively large for its diameter. The plane did not fall then = ( expected to give a venturi tube laminar undisturbed flow ) and gain velocity and pressure drop.
This link, which I received from you, thank you for that, it is only a substitute and the name of a venturi tube.
So the truth, this is just only enclosed propeller...
That is made that not only you have doubt. I had already dissipated before it, and historical perspective on the forum are Autosport.
http://forums.autosport.com/index.php?showtopic=74960&st=440 start post 461
Regards Andrew
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