Matthias... little did you expect to get your plane back. Have you flown it since its been repaired? I hope you'll have many more great flights with this aircraft. The KF airfoil concept continues to grow. Did you ever get to see Dave Powers "KF Airfoil Testing" on YouTube. It turns out that the KFm4 is faster than the other versions. Maybe its because 50% of this airfoil is air against air, thus no direct friction or drag. Be well.Dick Kline
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