The modclling of plasma outfiows from central gravitating objects such as AGN is bricfly discussed via analytic examples in the context of ideal MHD. The exact solutions are produced via a nonlinear separation of the variables in the full set of the MHD equations. Attention is given to the questions of initial acceleration and collimation of the outflow. A quantitative: criterion is provided for the transition of the morphologies from highly collimated jets to non collimated winds.