Iím glad to say that since I have been dealing with Iskra direct, they have demonstrated great willingness to listen to my concerns and responded quickly. The firm has applied a high level of engineering and scientific skill, and has updated my turbine to their latest production specification - Iím now very happy with the result in both noise and efficiency.
The output from the turbine is excellent and although I am not able to scientifically measure the power being generated it does seem to be impressive, with the cut-in at low wind speeds and a fast upward curve to maximum output. There is no doubt that this is a highly efficient machine.
This pretty much brings to an end the saga of my Iskra wind turbine and I wish all other wind turbine owners the best of luck with theirs.