Answer
Ƙarfin centrifugal da ke aiki akan zoben riƙewa na karkace na waje zai iya sa shi faɗaɗawa da ɗagawa daga tsagi. Ana ƙididdige madaidaicin izinin RPM $V$ ta amfani da $V = \sqrt{(4.48 \cdot 10^{12} \cdot E \cdot I \cdot g) /(w \cdot \rho \cdot R^3 \cdot (1 + \nu))}$, inda $E $ shine modulity, lokacin $$v shine lokacin $g $v shine lokacin $g $v shine lokacin $g $v shine lokacin $g $v shine lokacin $g $v. Nauyin kayan kowane tsayin raka'a, $\rho$ shine yawa, $R$ shine radiyon tsagi, kuma $\nu$ shine rabon Poisson. An kai wannan iyaka lokacin da faɗaɗa zobe ɗin saboda haɓakawar tsakiya ya wuce tsangwama a cikin tsagi. A cikin injunan sararin samaniya masu sauri, fasalulluka na kulle kai (shafukan da ramummuka) ana ƙara su zuwa zoben karkace don hana wannan faɗaɗa da injina, tare da yin watsi da iyakar RPM da lissafin centrifugal ya sanya.
