Finally, a recent Old Forum kPower post, referencing your interest (2019 Jun 6 at 8:08 PM)-
"[AWES] kPower Testing showing SS Power Kites Turning Tightest under Power
A few weeks ago, at Pierre’s suggestion, the subject of kite turn-rate recurred in the evolving context of maximizing airspace. kPower started working through its encyclopedic power kite quiver to compare turn rates, to validate heuristic prediction in favor of slower, lower-mass wings.
Using parafoils for session comparison, as the hotter higher-mass baseline, SS kites of the three major types (NPW, OL, and PLSS) were observed turning tighter and faster by equivalent wing area and wind velocity. The hotter parafoil somewhat overshot the heart of the Power Zone, where the SS more closely ruled, especially when both fly short-lined. With Rigid Wing kites based on super-hot gliders, the wide-turn effect is even more pronounced, as any glider pilot can predict. Hot wings can be made to roll and pitch a tight turn, but its an extreme maneuver that depowers and slows the hot aircraft, which then has to re-accelerate up to speed.
This anecdotal kPower result will be easy to directly confirm by third parties. It suffices to watch power kite and glider videos for non-dimensional pattern-flying laws. Its not just the higher inertial mass that makes turns large, but also common lack of vertical keel and/or wingtip/winglet area, so drastic roll-pitch input is needed instead."