The crossword solution for the term 'wing with no feathers' is ELL, which stands for an Elliptical Wing. An Elliptical Wing is an aircraft wing that has been designed to have an elliptical shape, which gives it a higher lift-to-drag ratio than other wings. This type of wing is often used on high-performance aircraft, such as fighter jets, due to its superior aerodynamic performance. It also has the advantage of having no feathers, which reduces drag and increases fuel efficiency.