Odd question this which requires a bit of background to give authenticity.
When I could afford to fly R22s from an airfield neat Stratford on Avon the Heli company’s owner’s son attended some kind of auction of Concorde parts and came back with part (or all) of a Concorde rudder which was duly mounted on the hangar wall.
I gazed long and hard at it (closest I ever got to the supreme lady) and noticed a series of mysterious ‘bolts’ sticking out of the rear edge of the rudder. One of the helicopter engineers present rubbed his beard thoughtfully and surmised they may be ‘static wicks’ – but nobody present was really sure.
All this of course went straight over my head but whilst they were all on tea break I managed to chip of a couple of flecks of deep blue paint from the rudder and stash them in a match box. (Back in Birmingham later that evening I sat with friends in the garden of the 'Rose and Crown' and we all touched reverentially those paint chips that had been places we could only dream of – but I digress).
What were those bolt like things on the trailing edge of the rudder?