In Chapter 18 of the 2nd Springer AWE Texbook, “Cosine Efficiency Gain” is used equivalently to “Cosine Gain” here, for the gain in power given by flying a power kite on top of a tower. Windy Skies has made no objective case for relegating this topic to “Scrapyard” due to “Cosine Gain” usage (while creating Topics so generic (adhesives, where to find weather data) they are not even AWE or kite topics as such)