MHI Vestas needed an accurate way of measuring the weight of its 80m-long turbine blades (the length of nine London buses back-to-back) at both the root and the tip upon completion of the painting process. The blades are actually made on the Isle of Wight before being transported to Fawley for painting and weighing. Accuracy is critical, as once the blades are weighed they are classified as light, medium and heavy for use on each turbine. Once the total weight of the blade is determined, the manufacturer is able to calculate how much ballast is applied to each blade to create the sets of three to make up a turbine. One rotation of a turbine (three blades) can power a typical home for up to 29 hours.