Winglets, inspired by the upturned wing - tip feathers of soaring birds, such as buzzards, eagles, and storks. Consider: During flight, the feathers on the wing tips of those large birds bend upward until they are almost vertical.
हे मोठे पक्षी उडत असताना त्यांच्या पंखांच्या टोकावर असलेली पिसं वरच्या बाजूला वळतात आणि ताठ उभी राहतात.