Torsional vibration is a concern in the crankshafts of internal combustion engines because it could break the crankshaft itself; shear-off the flywheel; or cause driven belts, gears and attached components to fail, especially when the frequency of the vibration matches the torsional resonant frequency of the crankshaft . Causes of the torsional vibration are attributed to several factors.
42.
Although " Schley " and two sisters authorized in 1915 ( originally " AA-2 " ), and ( originally " AA-3 " ) all made their design speed of, insoluble torsional vibration problems with their tandem engines made them very troublesome ships, and they were decommissioned in 1922-1923 after a service life of only a few years.
