You have published an interesting photo on the cover (Windpower Monthly, December 1997) of a Lagerwey turbine in the Netherlands. I believe it shows a lead-lag, or in-plane oscillation of the blades. If they were rotating at a constant rate you would get a smooth blurring of the blade image in the photo. I have seen this effect in photos of other turbines. It would be interesting to read the observations of others in the industry who have also noted this effect.
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