Furling asymmetrical sails (gennakers) using the "Top Down Verfahren®" (top-down method). The sail is furled from the top around a lightly tensioned furling axle (AT line with anti-twist coating). This ensures that large sails can always be hoisted and dropped safely – even with a small crew. The sail can be stowed quickly, safely and compactly once it is furled. The head of the sail is bent onto the special thimble on the swivel and the tack of the sail is bent onto a strop on the tack swivel above the furler. The luff of the sail curves automatically depending on the cut of the sail and length of the tack strop. A GENNEX system can also be used to furl existing gennakers, providing that the sail is not cut too deeply and the length of the luff is not significantly greater than the low-tension line. The furling mechanism will only work when the low torsion rope is placed under high tension, which is why the rope length should always be measured under load, to prevent the halyard from touching the blocks on the mast.