The long awaited final version of Jon’s study based on data he collected here in 2012-2014 has finally been published and is free to read or download here courtesy of Wind Engineering.
An important conclusion is the the table in the Recipe Book that shows the anticipated energy yields for various site windspeeds was (amazingly) not too grossly misleading. “Piggott’s estimates for the annual energy yields of his Recipe Book machines are an accurate prediction of their average real-world performance (+5/−20%). However, the performance of individual machines can be significantly above or below this (+70/−51%). These deviations are sometimes intentional, where reliability is prioritised over power performance, but often unintentional.”
Jon had already given me the basic data, much of which has been available on a page on this blog since 2015. The page complements his article in many ways, giving some more detail of the individual turbines’ performance.
