Yesterday I’ve published some pictures of the Thunderbirds performing a demo flight at Jesolo on Jun. 10 to explain the origin of condensation clouds generated by maneuvering aircraft. Here’s a gallery of the most interesting pictures taken during Jun. 10 and 11 rehearsals of Jesolo Air Extreme 2011.
Even though to the eyes of a spectator a Frecce Tricolori or Thunderbirds display overhead an airfield does not change much from the one which takes place over the coast line of a beach resort, the way display teams or solos fly may differ significantly depending on the environment in which the aerobatic display is executed. The different topographic features of the place where the air show takes place, and the surrounding landscape may, in fact, require the adoption of specific solutions in order to maintain standard distances and to correctly evaluate the separation from the terrain under peculiar light conditions. Familiarisation with the landscape and evaluating the display arena are the purposes of the preparation flight which precedes every display of a display team. In the case of displays flown over land, the terrain usually offers a multitude of fixed references which assist in the perception of speed, travelled airspace and altitude, such as crop lines, fields, roads, railways, and water courses.
Over the water, as at Jesolo, it is necessary to utilise buoys or boats which, besides delineating the display area in respect to a crowd line which is frequently extremely extended, allow the accurate determination of the display line, i.e. the line on the ground that is at least 3 Km long (1,5 Km to the left and right of display crowd centre), which must be perfectly visible from the air and placed at a distance of 230 metres in front of the public. This line constitutes the reference for the pilots for the safe execution of all the manoeuvres.
Although usually free of significant obstacles, displays flown over water can hide several traps as I’ve explained here. In those flown over the sea, the sunlight reflected on the surface may reduce into sun visibility, a phenomenon which also occurs when snow glare is encountered when flying over the mountains.
During rehearsals display teams can fly a modified display to get familiar with the display area and its references. For instance, the diamond formation of the Thunderbirds did not perform the high bomb burst on Jun. 10 while solos repeated some opposing passes while, on Jun. 11, the Frecce Tricolori’s solo did not perform the famous “crazy flight”.