Myslím, že není úplně zase tak náročný tou stránkou zarolovat trošku níž a přečíst si ;o)), že:
The trailing cone is used to measure the real static pressure around the airplane in order to modelize the errors made by the static pressure probes of the airplane. In flight the tube that links the cone to the tail is unrolled so that the cone is placed 100 meters behind the tail.
