Answer
Adadin raƙuman ruwa $n$ shine babban ƙayyadaddun ƙayyadaddun ƙimar bazara da kwanciyar hankali na hanyar sadarwa. Ma'aunin bazara $k$ yana da ma'auni tare da $n^4$, ma'ana ƙananan canje-canje a cikin ƙidayar igiyoyin ruwa suna haifar da gagarumin bambancin kaya. A cikin masu kunna wuta na karkashin teku inda ake buƙatar daidaitaccen shigar da hatimi, mafi ƙarancin $n=3$ yana da mahimmanci don kwanciyar hankali mai maki 3. Ƙara $n$ yana rage girman girman igiyoyin igiyar ruwa guda ɗaya da ake buƙata don jimlar tsayin da aka ba su, wanda ke rage ƙarfin lanƙwasa kowane igiyar ruwa $\sigma_w$. Koyaya, babban $n$ yana haifar da ƙaƙƙarfan bazara wanda ke kula da jurewar masana'anta. Ana kimanta kwanciyar hankali akan buckling don maɓuɓɓugan juyawa da yawa ta hanyar ƙimar tsayi kyauta zuwa ma'anar diamita ($H_f/D_m$); idan wannan rabo ya wuce 1.5, jagora na ciki ko na waje (shaft ko bore) ya zama tilas don hana juyawa ta gefe yayin kewayon $P = k \ cdot x$ layin layi.
