Whirling (nonplanar) motions of a base‐excited cantilever have been recently investigated by Crespo da Silva and Glynn. Some erroneous conclusions, pointed out here, have been reported in thisJournalby another author [J. Acoust. Soc. Am. 65, 931–939 (1979)] when reproducing an earlier paper written by Haight and King in 1972 [J. Acoust. Soc. Am. 52, 899–911 (1972)]. The results reported here are confirmed by numerical integration of the nonlinear integro‐differential equations of motion.