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But using a real wing is still much better than a model, says Spedding — and it sometimes throws up surprisingly different results. Previous studies using brass models had suggested that using swept-back wings helps swifts to boost lift by generating small vortices in the air-flow around the wings2. But Lentink's data contradict this theory; his results show that swifts generate lift more effectively by fully extending their wings.
http://www.nature.com/news/2007/070423/full/070423-7.html