Researchers at Concordia University in Canada have developed a 4D-printing method for vertical wind turbine blades that could cut production costs and simplify manufacturing. The blades start as flat composite sheets and then self-shape into the required aerodynamic form as internal stresses build during curing. This eliminates the need for complex molds and heavy processing equipment. Lab tests show the composite blades are about 80 percent lighter than aluminum ones while keeping the same aerodynamic performance. Turbines with the new blades reportedly spun faster than metal-bladed versions, which could mean higher energy output. The team says the method is especially suited for small vertical turbines on building rooftops in cities. If the process scales, it could lower the cost of distributed wind generation and open up urban installation markets in places like Uzbekistan where renewables are gaining traction.
