sentences:  The long fibres provide longitudinal stiffness and strength, and the matrix provides fracture toughness, delamination strength, out-of-plane strength, and stiffness.Material indices based on maximizing power efficiency, and having high fracture toughness, fatigue resistance, and thermal stability, have been shown to be highest for glass and carbon fibre reinforced plastics (GFRPs and CFRPs).Manufacturing blades in the 40 to 50-metre range involves proven fibreglass composite fabrication techniques.