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Hi, last week i flew the wing for the first time (this time in English, for more to understand) and it had really good flight characteristics, I trusted the plane basically after the moment it was in the air! The wing handled very well after takeoff and at low speeds but also gets very easily up to a good pace, even on low throttle.

I only had one problem though, when I went to full throttle (still with the FunJet motor) the tips of the wing started to swing heavily up and down (at ~150-180 km/h). After two full swings the wings broke loose and separated themself from the wing center.
After the crash I noticed that the area where the rear spar goes into the wing broke out, the rest off the wing is still intact, the motor mount was the only part of the fuselage taking damage.

I think this airfoil is just not designed for such high speeds, especially with the twist in the wing (I guess its for stability and overall better low speed characteristics). I think that your small red wing is better suited for fast flying as it has an "untwisted" wing, so I'll try that one for speed, but still keep the swept wing around and power it with a better suited motor to make it a relaxed flyer!