The wide blade foil is commonly a high performance impeller for higher viscosity applications in transitional fluid regimes. It is designed for applications in which an axial flow pattern is important, but at the same time very little localized turbulence is permitted. It is used in combined mixing requirements as abrasive solids suspending, homogenizing, gassing and heat transfer with low local shear also some fermentations with small volumes of gas/liquid blending.