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Moment of inertia
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== Measuring moment of inertia == The moment of inertia of a complex system such as a vehicle or airplane around its vertical axis can be measured by suspending the system from three points to form a trifilar [[pendulum]]. A trifilar pendulum is a platform supported by three wires designed to oscillate in torsion around its vertical centroidal axis.<ref>C. Couch and J. Mayes, [https://www.happresearch.com/blog/2018/2/18/trifilar-pendulum-for-moi Trifilar Pendulum for MOI], Happresearch.com, 2016.</ref> The period of oscillation of the trifilar pendulum yields the moment of inertia of the system.<ref>Gracey, William, The experimental determination of the moments of inertia of airplanes by a simplified compound-pendulum method, [https://digital.library.unt.edu/ark:/67531/metadc54717/ NACA Technical Note No. 1629], 1948</ref>
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