Recent content by norris

Hello, could someone explain some of the factors, or the calculation, for determining wind turbine cut in speed? I am talking about small wind turbines using with a single bearing on the rotating axis and a permanent magnet generator. A lot of literature targets a cut in speed of 3 m/s without...

Honestly, I'm not sure. Two options come to mind, 1st a copper strap with significant play to accommodate multiple rotations of the hub. 2nd some sort of slip ring but this could be prohibitively expensive in my situation. Do you have any advice?

The bolts were bent . Thank you for the links these have been informative. The point about void spaces is interesting. I will soon start to refurb this turbine, would you recommend trying to seal the void? My thought is, if zero ingress can't be guaranteed, in a future lighnting strike the...

The blades are a fibre glass / resin. Yes, washers were fitted and water in the thru hole is a definite possibility I don't know it was a lightning strike, I'm relying on the community who own the equipment giving me accurate information. Fatigue seemed less likely due to the age and...

Hello, I was recently onsite in the Philippines and the equipment owner stated their wind turbine had been hit by lightning. The only obvious damage was to the bolted connections at the root of one blade. One was sheared, the other bent. Does anyone have any experience of lighting causing...