S3A class missile. Drawing, description

MODELING
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S3A class missile. Tips for a modeller

Modeling

The model of the S3A class rocket of the winner of the S.P. Korolev Cup in 2008, Igor Danilov, is made according to the well-known scheme, called "Chelyabinsk". Its main feature, a distinctive feature, is the tail section elongated to 165 mm. This made it possible to slightly lighten (about 0,5 g) the stern, to shift the center of gravity of the model upwards.

The case is molded from two layers of fiberglass with a thickness of 0,02 mm on a mandrel with a variable section: the minimum diameter is 10,2 mm, the maximum diameter is 39,9 mm. The fiberglass blank is spread on a flat surface and impregnated with epoxy resin, adding a colored pigment to it. For better "wetting" it is heated with a hair dryer. The mandrel, pre-treated (lubricated) with paraffin separating mastic, is clamped into the lathe chuck and a fiberglass blank is wound. After a short drying time, a magnetic tape is wound onto the resulting housing blank for a better (tight) fit of the fabric layers. The body diameters are brought to the dimensions indicated in the drawing.

The tail cylinder, 41 mm long, is wrapped with Kevlar thread to increase rigidity.

Having allowed the resin to polymerize, remove the tape from the case and process its outer surface at low machine speeds (about 300 - 400 rpm). Then they face to the required length, remove from the machine, slightly heat the mandrel and get the finished body.

Stabilizers (three of them) are cut out of a 0,3 mm thick balsa plate, the side surfaces are reinforced with fiberglass and lavsan film. It must be admitted that the area of the "feather" of the stabilizer of I. Danilov's model is one of the smallest used by rocket modellers, and is about 14 cm2. In addition, the thickness is the smallest. But I can say that the stabilizers are rigid. They are glued end to end to the body. To one, along the gluing line - attach the model suspension thread. She's made of Kevlar.

S3A class rocket model by I. Danilov (Chelyabinsk), winner of the S.P. Korolev Cup (click to enlarge): 1 - nose fairing; 2 - connecting sleeve; 3 - suspension thread; 4 - parachute; 5 - body; 6 - wad; 7 - tail cone; 8 - engine compartment; 9 - stabilizer

The head fairing 100 mm long is extruded from 0,3 mm thick polystyrene. The connecting sleeve with a diameter of 39,7 mm and a length of 45 mm is machined from foam ball. For a length of 15 mm, it is glued into the skirt of the head fairing. A loop is fixed to the bottom of the sleeve, to which a suspension thread and a halyard connecting to the sides of the parachute are tied.

The preparation of the model for launch is carried out in the following sequence. First, two foam wads 35 - 70 mm long are inserted into the body from above. This is done to prevent the parachute from sinking down at the moment of launch (according to Newton's law). And this entails a shift in the center of gravity of the entire model to the stern.

Then the parachute is laid, previously sprinkled with talc, and the head fairing is placed, while carefully threading the suspension thread. Immediately before the start, the MPO is fixed.

The flight weight of the model without engine and parachute is 5,7 g.

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