Answer
Adadin bazara $k$ don magudanar ruwa mai juyi-juyawa Crest-to-Crest an samo shi daga ka'idar katako da aka yi amfani da ita zuwa sassa masu lankwasa. Ma'auni shine $ k = \ frac {E b t ^ 3 N ^ 4}{4 D_m^3 n}$, inda $E $ shine Modulus of Elasticity, $ b$ shine girman bangon radial, $ t $ shine kauri na kayan, $ N $ shine adadin raƙuman ruwa a kowane juyi, $ D_m $ shine matsakaicin matsakaici, kuma $n $ shine adadin juyawa. A cikin wannan saitin, jujjuyawar suna aiki azaman maɓuɓɓugan ruwa a jeri, wanda shine dalilin da ya sa adadin ya yi daidai da $n$. Dole ne injiniyoyi su tabbatar da jujjuyawar baya wuce kewayon layi, yawanci ana siffanta da $80\%$ na tafiye-tafiyen da ake da su don gujewa gurɓacewar igiyar ruwa ko 'ƙasa' wanda ke haifar da ƙaƙƙarfan ƙaƙƙarfan ƙaƙƙarfan layi.
