the secret is the little blue elecktric between rx and servos from momo-sauerland.de/index.php/modellbau/spezial-losungen/ its the „Genua-Mischer Doppelwinch“ 22.-€
How do you keep the sheets/lines from getting fouled? So long as there is tension, (as demonstrated) this system works great. But won't slack lines cause a tangle?