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We consider various hadron models with a string carrying $n=3$ massive points(quarks): Y configuration, linear baryon model $q$-$q$-$q$ and the closedstring. For these models classical rotational states (planar uniform rotations)are tested for stability with respect to small disturbances. It is shown thatrotations of all mentioned models are unstable, but nature of this instabilityis different. For the model Y the instability results from existence ofmultiple real frequencies in the spectrum of small disturbances, but for thelinear model and the closed string the similar spectra contain complexfrequencies, corresponding to exponentially growing modes of disturbances. Thisclassical rotational instability is important for describing excited hadrons,in particular, for the linear model and the closed string it results inadditional contribution in width of hadron states.

Contribution to Hadrons' Width from Classical Instability of Y Configuration and Other String Hadron Models