Is there a difference in weight between a metallic and a fiberglass fan blade?
That depends on the type of metal used and the thickness of the blade material. A sheet metal fabricated blade is typically lighter than one made of cast aluminum. An industrial fiberglass blade of the same size and profile is usually heavier than a fabricated blade but lighter than a cast aluminum blade. The compression strength to weight ratio of fiberglass is excellent as compared to either fabricated or cast aluminum blades.
