1) Aircraft wing component
Found on
https://www.crosswordclues.com/clue/wing-fence
Wing fences, also known as boundary layer fences and potential fences are fixed aerodynamic devices attached to aircraft wings. Not to be confused with wingtip devices, wing fences are flat plates fixed to the upper surfaces (and often wrapping around the leading edge) parallel to the airflow. They are often seen on swept-wing aircraft. They obstr...
Found on
http://en.wikipedia.org/wiki/Wing_fence
No exact match found.
