Category S4. The rocket plane is an aircraft that is lifted into the air using the thrust of the rocket engine, and returns to earth planning with the engine off — using the aerodynamic lifting force. This requirement applies to all three categories of rocket gliders for the duration of the flight — S4, S8, S10. And each has its differences. S4 — model glider with an accelerator, which can be separated during the flight. S8 — model RC rocket glider S10 — a model rocket with a soft wing (wing “Rogallo”).
Model category raketoplana “age” are not inferior parachute models (S). At the stage of appearance and development of rocket modeling was not dividing them into separate categories, there was only one category of raketoplana.
In 1966, the international aeronautical Federation (FAI), specifically its Commission on space models developed by the sporting code in which all raketoplana were divided into four classes and had a bird name: “Sparrow”, “swift”, “eagle” and “Condor”.
On the amended in 1975 and 1989, the code of the FAI, was the division of raketoplana into categories and classes depending on the total impulse of the engine and the starting mass. Classes are five, and since 2001 — six, and refined the requirements in each category.
Today our conversation is about the category of raketoplana S4 — models of gliders with the accelerator. It is divided into five classes. The most popular class Ѕ4А — championship. Technical data requirements sports “shells” are: the minimum starting weight — 18 g., the maximum is 60 g. In flight, the engine must be separated from the model only in the container and land on the ribbon (smallest 25×300 mm) or a parachute with an area of more than 4 dm2. If this condition is not complied with — flight is considered a non -.
Since the inception of the models raketoplana this category was always distinguished by an abundance of schemes and designs. It has been a continuous search of original technical solutions, in it there is a place for creative ideas Modeler-constructor.
Speaking of models raketoplana S4, it is possible to allocate three main schemes for which the building today sports “shells” in this category. The first model is the so-called “airplane” scheme. With the construction of raketoplana that looks like a plane, originates the development of the models in this category.
Apparently, then, rocketmodeler felt some impact of aviation is often required to have a sustainable plan, it is necessary to build the model according to the classical scheme, that is, “airplane”.
But I must admit that today such a scheme aircraft almost does not apply. The main reason — high probability of getting zero marks for takeoff. Very often judges do not appreciate this start, since the rise in use of the aerodynamic lifting force.
The missile has been looking for ways of perfection of the starting characteristics of their rocket gliders. So, in 1972, A. Gavrilov (Krasnozavodsk) developed a model of the rocket plane with rotating wing along the fuselage. Modelist S. Morozov (Electrostal) in 1974 suggested that the wing console before the start, which evolved to the center was diverted to the tail, acting as a stabilizer, and after the operation of lifting charge MRD held the position for planning.