UP Summit XC4 – first experience with prototype

Recently I had a chance to fly UP Summit XC4 prototype. Luckily during testing day in Garmisch-Partenkirchen I met all possible conditions, from calm air with minimum wind to violent thermals, landing in turbulent 10 ms valley wind and calm soaring with many wingovers. As having some experience with XC3 version I liked this version more. Interested in reasons?

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