Reliable engine that weights 18 kilograms and has 50 HP at 8750RPM? That is all possible thanks to Mercedes-Benz sponsorship for Wankel engine kart programm and AIXRO Wankel XR50 engine was born. With outstanding characteristics like high reliability, high power to weight ratio, no vibrations makes them especially suitable for installation in aircraft or oder demanding applications. Based on XR50, Gilo Cardozo developed Rotron engines capable flying at 9000 meters on GKN mission above Everest. That are very good news for motoparagliding society and ultralight builders. The only obstacle is the rpice which is around 4500 EU ready to fly.