Answer
Lokacin da sandar igiyar ruwa ke jagoranta, diamita na sandan $D_{sanda}$ dole ne ya yi lissafin mafi ƙarancin diamita na cikin bazara $ID_{min}$ cikin duka bugun sa. Saboda maɓuɓɓugan ruwan raƙuman ruwa suna faɗaɗa radially lokacin da aka matsa, $ID$ a zahiri yana ƙaruwa kaɗan, amma $ID$ na farko a tsayin kyauta shine ƙayyadaddun abu don shigarwa. Ana ba da shawarar izini na $0.05$mm zuwa $0.5$mm yawanci. Bugu da ƙari, saman sandar matuƙin jirgin ya kamata ya zama $\text{Ra} 0.8 \mu\rubutu{m}$ ko mafi kyau don rage juzu'i. Idan sandan ya yi ƙanƙanta sosai, bazarar na iya 'snaky' ko kuma ta ɗaure a ƙarƙashin kaya, wanda zai haifar da isar da kaya mara layi da yuwuwar hulɗa tsakanin igiyoyin ruwa da sandar, wanda ke haifar da lalacewa da hayaniya.
