John Patrick Ettridge writes: “The problem with the current Savonius type wind turbines is the fact that the blades are only driven by the wind for approximately 120 degrees of one rotation, that is from the direction of the oncoming wind to about 120 degree from the center, the remaining 240 degrees, the blades are actually using power, and have to be driven into the wind. The solution that I came up with was to allow the normal operation for the 120 degrees of the turn, and for the remaining 240 degrees to place a shield, or skirt to cover the blades in the area that they normally would need to be driven into the oncoming wind, and by using overhead air scoops, directed the air above the rotor down into the tunnel created by the rotor and wind shield. This has the effect that the blades on the rotating turbine are driven for the full 360 degrees, greatly improving low wind speed start up efficiency, and by rotating the skirt and scoops effectively feathering the rotor in high wind speeds. The wind shield also can be moved, to ensure the wind scoops are facing the direction of the oncoming wind, either by a wind tail or mechanical means.”
Excellent idea. Have you measure the efficiency of the conventional versus your shrouded version?
great!!!
one question: what type of bearing did you use for it?
Ha ha, man I was just sketching here on the same design and then I found your video! They are very elegant. 5 stars, favorite – thanks for uploading.
Ok you beat me to it. Good job!
very clever!!! a very cheap way to get more bang for your buck!!
Poor efficiency of this ;o(
i have a much better idea: my turbine efficiency 80% !!!!!iiii!!!! !
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