New carbon fiber wind blade method skips molds, cuts weight by 80% for rooftop turbines

Researchers at Concordia University have developed a way to make curved carbon fiber wind turbine blades without expensive custom molds. The method uses standard autoclave equipment and relies on the natural contraction of carbon fiber plies during cooling to form the blade shape. This eliminates a major cost barrier for small rooftop vertical-axis wind turbines. The resulting blades weigh about 80 percent less than aluminum blades and spin faster in lab tests, meaning better power capture from the same wind. For urban installations, lighter blades reduce structural load limits and can lower building reinforcement costs. The technique works with existing composite manufacturing equipment, so no new hardware is needed. The approach is currently demonstrated at small blade scale. Scaling to larger blades or more complex geometries will require further work. But for the distributed wind market, this method could improve the economics of rooftop turbines and expand their deployment in cities.