Winglets increase efficiency by reducing lift-induced drag. They do this by relocating and diminishing the vortex at the wing’s tip, resulting in lower fuel burn, higher cruise speed and longer range.
In Cologne, Germany, the $412 million European Transonic Wind Tunnel (ETW)– a multinational joint venture among France, Germany, the Netherlands and the UK–is gradually increasing its workload. The main feature of the wind tunnel is the use of cold nitrogen to aerodynamically offset the smaller size of the model tested, compared to the actual aircraft.
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