Answer
Ƙwayoyin riƙon karkace na waje suna iyakancewa ta sojojin centrifugal waɗanda ke haifar da faɗaɗa zobe da rasa haɗin gwiwa tare da tsagi. Matsakaicin saurin jujjuyawa $V$ (a cikin RPM) ana ƙididdige shi ta amfani da $V = \sqrt{\frac{4.8 \cdot E \cdot H^2 \cdot I}{D^3 \cdot \gamma \cdot (1-\mu^2)}} $, inda $E $ shine Modulus na Nauyi, radial $ H$ shine lokacin $ I. diamita na kyauta, $\gamma$ shine yawan kayan abu, kuma $\mu$ shine rabon Poisson. Don aikace-aikacen sararin samaniya mai sauri, fasalulluka na kulle kai (shafukan da ramummuka) an haɗa su don hana zobe daga faɗaɗawa da injina. Idan an wuce iyakar ƙididdigewa, zoben zai ɗaga ƙasan tsagi a madaidaicin gudu $V_{crit}$, yana haifar da asarar riƙewar axial da yuwuwar gazawar tsarin bala'i.
