Windspeed[ Parent ]
Furling is not a precise process and the peaks of the current will often shoot well over the intended value, as long as it is not sustained it doesn't matter. Most machines drop power in high winds beyond the start of furling, this way is safer even if it gives reduced output.
I have never used anything other than aluminium for vanes, wood is heavy and rots and falls to bits here. Aluminium is claimed to fail with fatigue vibration and an unsupported sheet will not last long but I fold the top and bottom edges at 90 to stiffen it and fit a couple of damping strips to prevent vibration excitation. I have had no failures. Flux[ Parent ]
