Answer
Gefen gefen, ko 'wurin tsagi' $Y$, dole ne ya wadatar don hana abin da ake yankewa a ƙarƙashin kaya. Mafi ƙarancin nisa $Y$ yawanci ana ƙididdige shi azaman $Y = \ frac{K P}{D \pi S_y}$, inda $P$ shine nauyin turawa kuma $S_y$ shine ƙarfin kayan amfanin gona. Ga yawancin aikace-aikacen, ƙa'idar babban yatsa shine $ Y \ ge 3G$ (zurfin tsagi sau uku). Idan gefen gefen ya yi ƙanƙara, kayan da ke tsakanin tsagi da ƙarshen ramin zai 'busa' a cikin yanayin rashin lalacewa, koda kuwa zoben da kansa yana iya ɗaukar kaya.