THE “OLDEST” CATEGORY OF MODEL ROCKETS

Of all classes and types of rocket parachute patterns category S3 the most “ancient”. At the dawn of the emergence and development of rocket modeling one of the criteria of the competition was the duration of the flight. At that time it was a simple and straightforward comparative characteristics of flying model rockets. By the way, today the flight is the determining factor the benefits and performance of model rockets with a parachute. And watch the in-flight model with a large beautiful dome — fun.

 
Since the first competition model rockets category S3 is always present when the program starts. So, the first world champion in 1972 by the models on the duration of the flight with a parachute was a Romanian athlete ion the Parliament. Of our compatriots, the winner of the world championship was Alexander Mityurev (1983), Igor Shmatov (1990) and Sergey Karpasov (2004) At the 16th world Championships in Baikonur in the class of models of EZE were the first among adults — Michal Zathan (Poland) young men — Dmitry Lyakh (Ukraine) the Russian “rocket” — Pavel Krasnov (men) bronze — Sergei Karpushova.
 
Category parachute model rocket (S3) depending on the MRD is divided into four classes and the Championship in boys, and in adults is a class Ѕ3А. Requirements for sports “projectile” such tier — one diameter at least 40 mm length — 500 mm starting weight — does not exceed 100 g, the engine is one (pulse — no more than 2.5 n of C). The parachute must have at least three slings.
Competition for the duration of the flight with a parachute is held in three rounds Maximum fixed by the time round 5 minutes. If several participants after three rounds will score maximum amount of points between them are optional tours (not more than two) to determine the winner. Those who are going to build models of missiles Ѕ3А, including need to know when flying their sports “shells” cannot be counted a) did not work recovery system; b) after the start of the model flew horizontally,) there was a separation of the engine or any parts of the model, there is a break of a parachute (parachutes).
 
During its short history the development of technical requirements for the models have changed and improved. Thus, until 2000, the minimum diameter was limited to 30 mm, and in 2001 it increased to 40 mm, a length of 500 mm. of Course, this added work athletes rakatomalala. Had to develop a different technology of production while maintaining minimal weight characteristics. After all, with the same engine (2.5 n ) was necessary to reach the same altitude as when the greatest amidships with a diameter of 30 mm.
 
A model rocket class S3A V. Tarasova
 
A model rocket class S3A V. Tarasova:
 
1 —loading; 2 — heat shield; 3 — the connecting plug; 4 — thread attachment of a parachute; 5 — hinge; 6 — casing; 7— wad; 8 — strand suspension housing; 9 — tail cone; 10 — stabilizer

 
One of the first developers of models of the S3 category with a diameter of 40 mm was honored coach of Russia Vladimir Tarasov from Chelyabinsk. With this model he won Vserossiyskih championship S. P. Korolev in the spring of 2001 and four the next. In addition, the model is universal: it can be used in class S6A.
 
It is made by widespread technologies — molding of fiberglass. The hull is laminated together with the tail cone on one mandrel of a larger diameter which is 40 mm and the smaller of 10.1 mm. Thickness fiberglass — 0.03 mm (in two layers). After drying, the resin housing is slightly cracked.
The feathers of the stabilizer made of balsa veneer thickness 1.5 mm and glued with epoxy to the butt of the propulsion of the hull.
 
One of the feathers attached to the thread diameter 0.6 mm suspension system of salvation and head fairing.
 
From the same fiberglass and molded fairing. It is conical in shape with a cylindrical skirt with a length of 12 mm. the Apex of the cone from the inside filled with resin to a depth of 10 mm. This strengthens the fairing and is a kind of loading it. The connecting sleeve is carved from foam and glued to the skirt fairing. It is fastened the thread of the rescue system, which is associated with the thread suspension.
 
A simple model of a parachute
 
A simple model of a parachute:
 
1 — fairing; 2 — hinge; 3 — strand (rope) of the suspension of the parachute; 4 — chute; 5 —housing; 6 — ring; 7 — regulator 8 — MRD

 
The parachute model is carved from a Mylar film with a thickness of 5 microns, the number of lines 16, the diameter of the dome — 850 mm.
 
Before flying into the body is inserted into the foam wad with a length of 40 — 45 mm, and sometimes two. As it strengthens the body and helps to keep the rescue system in a specific location without disturbing the alignment of the model.
 
The mass of the model without a parachute and engine — 8, Engine — In-2-3 “Vulcan-jet” the author’s development and production.
 
It should be noted that this model is a rather complex sport “shell.” Who first wants to build and participate in competitions, I suggest to start with a simple and affordable model with a parachute. It can be recommended to those who want to specialize in this class of model rockets.
 
Body length 456 mm made from two layers of paper with a thickness of 0.13 — 0.15 mm on the mandrel with a diameter of 40 mm After drying in the tail part of it glued to the clip under the engine. Machined it out of foam on a lathe, inside make a hole with a diameter of 10 mm for engine mounts. Stabilizers (three of them) cut out the pattern of the ceiling plate of foam thickness of 4 mm. the Front and rear edge slightly round off side for rigidity coated with PVA glue — reinforced. Fastened them at the butt to the body, in the tail part.
 
Fairing machined from hard foam (PVC) with a total length of 70 mm. from the Bottom end of the landing skirt fairing glued a loop for attaching the suspension thread of the housing and the parachute. The guide ring or two. Glue them on the mandrel with a diameter of 5 — 6 mm and are fixed to the housing.
A parachute with a diameter of 600 — 800 mm are cut from mcalenney paper. Slings (12 pieces) length of 900 — 1000 mm is attached along the edges of the dome paper plates or strips of tape. Their free ends is reduced in one knot and tied to the loop on the skirt fairing. Paint the model in bright contrasting colors nitro.
 
Flight weight of the model without MRD — 15 — 17 g, start with agnostinelli launchers with a diameter of 5 mm.
 
The model described above can serve as the first sports a “shell” for beginners rocketmodeler.
 
Modern, more perfect model class Ѕ3А a few years ago developed a now famous athlete from Dubna Igor Ponomarev. Its body is made of ordinary writing paper (for Photocopying) density 80 g/m2 . Athlete widely introduces its innovation in competitive practice. Admittedly, he has a lot of followers. These chassis he used to build models categories S6 and S9, which repeatedly became the champion of Russia in these categories. I believe that the proposed I. Ponomarev available technology will be useful to many rakatomalala.
 
A model rocket class S3A I. Ponomareva
 
A model rocket class S3A I. Ponomarev:
 
1 — fairing (polystyrene); 2 — body; 3 — tail cone; 4 — thread suspension model; 5 — a thorough compartment; 6 — stabilizer; 7 — MRD; 8 — retainer MRD

 
The case is made of paper, made of three elements; conical and two cylindrical. Basic cylinder length 275 mm glued on a mandrel with a diameter of 40 mm, a tail length of 59 mm, the mandrel diameter of 10.2 mm. Between the cylinders connect the cone with a length of 125 mm. the narrow part on a length of 40 mm made of two layers of paper. Gluing the overlapping width of the belt is about 4 mm. outside Finished case cover with two layers of nitrocellulose lacquer. Its weight is 6.5 g.
 
Feathers stabilizers (three of them) are cut from the balsa plate thickness 0.9 mm. the Lateral surface is reinforced by paper and varnish. To the body of the engine compartment stabilizers glued back to back. Along one of them is fixed on the epoxy resin retainer MRD length 72 mm, curved made of steel wire with a diameter of 0.5 mm. it is glue and thread pendants parachute made of Kevlar.
 
Fairing stamped from polystyrene (a jar from under yogurt). The dome of a parachute with a diameter of 900 mm from a metalized polyester, sling — 16 PCs.
 
Speaking about models of missiles Ѕ3А, it is impossible not to take into account the main design element — the parachute. It. more specifically its diameter, is, that from him at 80 — 90% depends on the time of flight. But today, the diameter of the parachute the majority of participants of this class ranges from 900 — 1200 mm Material — metallized Mylar film with a thickness of 3 to 5 microns. (This applies in large space — hang it coiled objects spacecraft). The number of lines from 12 to 16 pieces. For optional tours athletes use parachutes with a diameter of the dome is about 1.5 meters.
 
Another important ingredient of successful performance of rocketmodeler you should consider into account the meteorological situation, the ability to navigate in it. And most importantly — accurately select the beginning of the campaign. It’s not always flying models are made in ideal circumstances — with complete calm. And the presence of upstream or downstream significantly affects the duration of the flight. The determination of these athletes often use all sorts of fire detectors, installing them at the start on a long pole. But an absolute guarantee of finding updrafts for the start of they do not. Usually the sensor is installed at a low height, about 4 — 5 m, but the model takes off for 250 — 280 m. And if there Termik at the start, he can’t always be on top, where the opening of the parachute of the model rocket. Summarizing the above, I note that the sum of all the constituent elements of the competitions, their knowledge and their correct use of athletes for successful performance.
 
V. ROZHKOV

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