The collective and molecular dynamics of ferroelectric liquid crystalline side group polasiloxanes has been investigated be use of broadband dielectric spectroscopy (10(-2)Hz - 10(9)Hz). In the lower frequency range (<10(6)Hz) two collective relaxations, Goldstone - and soft - mode, could be observed. They are assigned to the fluctuations of the phase and the amplitude of the helical superstructue, respectively. In the high frequency regime (10(6)Hz - 10(9)Hz) one dielectric relaxation, the beta - relaxation, is found. It is assigned to the hindered rotation (libration) of the mesogene around its long molecular axis. It shows an Arrhenius - like temperature dependence with no deviations st the phase transition S-A/S-C*. A dilution of the mesogenes causes a decrease of the collectivity but remains the local dynamics uninfluenced.