CHELYABINKA IGOR DANILOV | MODEL CONSTRUCTION

Model missiles Ѕ3А Cup winner S. P. Korolev 2008 Igor Danilov made by well-known scheme called “Chelyabinsk”. Its main feature, distinguishing feature is elongated up to 165 mm tail section. This helped a little to alleviate (about 0.5 g) stern, to shift the center of gravity of the model up.

The housing is formed of two layers of fiberglass with a thickness of 0.02 mm on a mandrel of variable cross section: the minimum diameter of 10.2 mm, a maximum of 39.9 mm. Billet fiberglass spread out on a flat surface and impregnated with epoxy, adding the color pigments. For better “wetting”, it is heated with a hair dryer. Mandrel, pre-treated (oiled) paraffin separation with mastic, is clamped in the Chuck of the lathe and the blank is wound from fiberglass. After a short drying the billet housing for the best (tight) fit of the layers of fabric wound tape the tape. The diameters of the housing is adjusted to the measurements indicated in the drawing.

The rear cylinder with a length of 41 mm to increase the rigidity wrapped with Kevlar thread.

Giving polimerservice resin, magnetophonon remove the tape from the hull and treated at its outer surface at low speed lathe (300 — 400 rpm). Then butt up to the required length, removed from the machine, slightly heat the mandrel and receive the finished case.

Stabilizers (three of them) are cut from the balsa plate with a thickness of 0.3 mm, the side surface reinforced with fiberglass and Mylar film. I must admit that the area is “pen” stabilizer model I. Danilov — one of the smallest used by rakotomalala, and is about 14 cm2. Besides the thickness is the smallest. But I can say that the stabilizers hard. To the body butt glue them. One, along the line of gluing — attach thread pendants model. It is made of Kevlar.

Model missiles Ѕ3А I. Danilov (Chelyabinsk), winner of the Cup of S. P. Korolev

Model missiles Ѕ3А I. Danilov (Chelyabinsk), Cup winner Sergei Korolev:

1 — fairing; 2 — connecting sleeve; 3 — strand pendants; 4 — chute; 5 — housing; 6 — wad; 7 — tail cone; 8 — engine; 9 — the stabilizer

Fairing with a length of 100 mm extruded polystyrene with a thickness of 0.3 mm connecting sleeve with a diameter of 39.7 mm and a length of 45 mm machined from a roll of foam. At a length of 15 mm glued into the skirt fairing. In the bottom part of the sleeve fixed loop to which you tie the thread to the mount and tether the connection with the sides of the parachute.

The model preparation for the launch is carried out in such sequence. Initially the top in case put two wad of foam with a length of 35 — 70mm. This is done in order to avoid sedimentation of the parachute down at the start (Newton’s law). As it entails the displacement of the center of gravity of the whole model to the aft.

Then stack parachute, previously dusted with talc, and put the fairing, carefully tucking the thread suspension. Just before the start fix MRO.

Flight weight of model without motor and parachute — 5.7 gr.

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