 These properties are a result of the interplay of non-Newtonian properties (viscoelasticity, shear-thinning) with gravitational, viscous, and inertial effects in the jets.Free surface continuous jets of viscoelastic fluids are relevant in many engineering applications involving blood, paints, adhesives or foodstuff and industrial processes like fiber spinning, bottle-filling, oil drilling etc.In many of these processes, an understanding of the instabilities a jet undergoes due to changes in fluid parameters like Reynolds number or Deborah number is essential from process engineering point of view.