In June 2010 I replaced the standard and very noisy black windblades on my Air X windgenerator with a set of blue Silentwind blades produced by Spreco in Portugal
. I have been very happy with them, especially with the noise
But then, in December 2011, I discovered that two blades were cracked at the leading edge. These blades have only seen two strong wind
occasions when I was in port with the wind generator
in the brake position. I also never had them contact any ropes or flying birds / objects.
I sent them in to Spreco for technical analysis but no light was shed on the reason for the cracking.
Has anyone else experienced this problem with the Spreco blades?