Abstract
High resolution spectra have been used to determine the expansion velocities of a large sample of planetary nebulae around [WC] central stars. The results are compared with expansion velocities of non-WR planetary nebulae. All the data were obtained in a consistent way. We find that WRPNe have larger expansion velocities and larger turbulence than non-WRPNE, demonstrating that the mechanical energy of the massive [WC] stellar wind strongly affects the kinematical behavior of nebulae. A weak relation between stellar temperature and expansion velocities has been found for WRPNe, indicating that older nebulae expand faster. This could be useful in testing the evolutionary sequence proposed for [WC] stars.
