Yes, the kite is 1 kg, flying parts around 0.5 kg
About slippy phenomena and ageing of the belt: We have 4 identical test bench. We can change many parameters like belt tensioning. With increasing belt tensioning you increase the adherence. Diameter of pulley are also to be considered. And We will use a gear on kite part, as for kiwee that already has a multiplier within the right angle transmission. We are working on a video that shall be released in a month showing those test bench. They represent the beginning of the ADEME program. Agence de Devellopement et de la Maîtrise des Énergies for the accronym 
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