New built training model aerobatic aircraft surprised everyone, ourselves including. So successful was the combination of spectacular appearance (which is very highly valued by only pilots, as well as time of flight affects the evaluation of judges), the extraordinary simplicity and manufacturability, durability and good flight properties. Therefore, while the new aerobatic machine and is “preseminary” character, we named it “Extra”. It should be noted that the potential flight performance of this model is enough to perform the second sports category.
Almost all the main advantages of pilotage obtained through unusual aerodynamic and power circuit of the wing. Because it has no frame as such! Any Reiki spar, no ribs — all replace only one power circuit of a metal tube of constant cross section. Thanks to this the opportunity to make full use of advantages of “pliable” skin, made from metallic Mylar film with a thickness of 0,021—0,03 mm. It is the paneling, wrought in the figures, allows to achieve good handling characteristics in the absence of the pronounced profiling of the wing and its mechanization. By the way, the effect is more pronounced at high values of the specific load on the supporting surface and is particularly pronounced in the modification of the “heavy” class with an engine displacement of 6.5— 1 cm3.
Another important factor that has a significant impact on the choice of model type today, unfortunately, is often the availability of materials. This is also our model has no equal. After all, the Power circuit of the wing is bent… gymnastics rings (for doing hula Hoop), which you can find in any store. Forming circuit requires considerable effort. Maybe at first you’ll spoil the blank, but then the next will surely meet the highest requirements. Before forming need to cut the connection part of the ring and initially only to straighten the pipe in the zone of the leading edge of the wing. Small radii of bending in the “endings” better to fit together, around be firmly attached to the round tower.