Hydrofoil blade for producing turbulence

A hydrofoil blade for use in a paper making machine of the type wherein hydrofoil blades are positioned beneath a forming medium and extended in the cross machine direction relative to said forming medium for draining water through said forming medium while a paper web is being formed on said forming medium and for forming said paper web, said hydrofoil blade comprising a plurality of separate and distinct surfaces including a forming medium bearing surface lying in a first plane and having a leading edge, a lower surface lying in a second plane and spaced from said forming medium bearing surface, at least one dewatering surface diverging downward towards said lower surface from a respective of at least one crease line, and at least one intermediate surface extending from a respective of said at least one dewatering surface to a respective of at least one other crease line, each of said at least one intermediate surface including in tandem in the machine direction (a) a vacuum decay surface extending from said at least one dewatering surface, (b) a turbulence generating surface extending upward from said vacuum decay surface and upwardly of said lower surface, and (c) a trailing surface lying in a third plane and extending from said turbulence generating surface to said at least one other crease line, said third plane lying between said first plane and said second plane.