As the rope passes round the drum the turns have a tendency to ride from the middle towards one end; this tendency is counteracted by the load on the rope forcing the turns down the curve to the narrowest part of the drum.
Xa intambo igqitha ngokokujikeleza kwegubu amathuba anesimo sokukhwela embindini ukuya kwisipheto esinye, lo mkhwa ubalelwa ngokomthwalo wentambo enamandla ejike phantsi kwicala elide lecala lendawo.