The Quietrevolution (often stylized with lower-case "q": quietrevolution) was a brand of vertical-axis wind turbine before going into administration in 2014. The helical design is most similar to the Gorlov helical turbine. Both are an evolution of the Darrieus wind turbine. It had won several awards including the "Sustainable Innovation Award" in 2006 but did not perform. The qr5 turbine, rated for 6 kW, measures 3.0m in diameter by 5m high.