Tacke Windtechnik says it has completed a DEM 150,000 blade test programme to ensure that its rotors can withstand anything the German elements can throw at it, including the country's highest recorded wind speed over the last 50 years -- 65.1 m/s. The programme was carried out with Abeking and Rasmussen, which manufactures blades for Tacke, and supervised by Germanischer Lloyd. The blades were subjected to increasing force at four different points to simulate wind pressure. The aim was to discover whether they would withstand the 65.1m/s gust plus the 1.5 safety factor demanded by Germanischer Lloyd. The tests showed that with the application of a load of ten tonnes, the forces on the blade at a radius of 7-8 m around the hub were 25% higher than the 50 year gust-plus-safety-factor. Directly adjacent to the hub the force corresponded to twice the 65.1m/s load, plus safety factor. The blade withstood these extreme conditions for eight minutes before breaking at the glass fibre laminate.
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Senior Renewable Energy Analyst (WindGEMINI Product Lead) DNV GL Bristol (City Centre), City of Bristol