... Obtained values of coincide well with the characteristic value of this quantity for supergiants of early spectral classes: (de Jager 1980). ... From eq. (18) we get: It coincides well with our maximum value (see table 3). ... We get: It also coincides with our estimates of the maximum stellar wind velocity: With different assumptions for the turbulent velocity (for example ) we can get excellent coincidence of our results with the stellar wind velocities estimated above using other techniques. ...