| Answer | Crossword Clue |
|---|---|
| WINGLET | Part of an aircraft that helps reduce drag |
| spoilers | A flap on the wing of an aircraft or glider that can be projected in order to create drag and so reduce speed |
| riblets | any of a series of microscopic grooves set into a material that is applied to the exterior surface of aircraft or boats to reduce drag |
| riblet | any of a series of microscopic grooves set into a material that is applied to the exterior surface of aircraft or boats to reduce drag |
