as depicted for example in fig5 a hydrofoil blade having the desired characteristics can be provided it should be emphasized that any desired combination of segments can be provided another form of a turbulence generating multiblade hydrofoil is shown in fig6 and 7 these figures show a blade as for example of the type depicted in fig1 wherein the generation of turbulence is facilitated at points along the length of the blade by the selective removal of small controlled amounts of water across the width of the papermaking machine this water is removed from the surfaces 20 24 of the blade through small channels 130 132 cut into it these channels are tapered downwardly in the cross machine direction plane 7 7 of fig6 as shown in fig7 to effect uniform or controllable removal of water the lower end of the tapered channels feed tubes 134 which extend in the cross direction of the machine to its front and back side where valves 136 control the rate of their discharge into the wire pit not shown in operation the downward removal of water through the channels 130 132 from the small space 138 between the forming medium and the surfaces 20 24 creates a small downward force on the fabric when this force on the fabric is terminated by its travel in the machine direction 4 past a respective channel such a downward force decays instantly and allows the forming medium to spring back upward to its original plane of travel this upward spring of the fabric causes stock jump or turbulence in the same manner as the instantaneous decay.