... have been developed as drives for axial fans with blade diameter from 500mm to 910mm , for backward ... plastic blades ( Hyblades ) or die-cast blade: in both variants , the blade ends have been optimized by using “winglets” ... operation and at same , high efficiency , different blade angles for each diameter make it possible to configure ... motors of size 094,110,138. ebmpapst 500 mm AC axial fans-hyblade