  The dynamics of baryon string model Y (three-string) is considered with using
the approach that implies defining a classical motion of the system on the base
of given initial position and initial velocities of string points. The analysis
resulted, in particular, in the necessity of regarding more wide (than it was
supposed earlier) class of parametrizations of the world surface for the
adequate description of the three-string model. This approach let us to
ascertain that the classic rotational motions (flat uniform rotations) for this
string configuration are unstable. Any small asymmetric disturbances grow and
inevitably result in falling a quark into the junction.
