NEW TECHNOLOGYWith all the advantages of fiberglass hulls for model rockets the traditional process of production is highly labor-intensive and unsound. Meanwhile, the conversion gave the modelers a new and very interesting material is heat resistant fiberglass gasket STP-4. It is used widely and, having a small official shelf life, often charged and often goes to the shops “Junior technician” or “Do it yourself”.

This fiberglass is good that at thicknesses of 0.025, and 0.10 mm 0,062 it at the factory is impregnated with a sufficient quantity of partially polymerized epoxy resin. In our group developed the technology of manufacturing round parts of similar material, which, hopefully, will be interesting to meet many modelers from other classes (not just rocket).
Work is being done together. First on polished and covered with anti-adhesive mastic mandrel carefully wound of three to four layers of cable paper, which is carefully smoothed. Then the top, keeping the same winding direction as the paper smoothly and tightly wind the fiberglass STP-4. The pattern should exceed 40 — 50 mm of required length tubular parts. Restrictions on the number of layers, here, are guided only by considerations of weight and strength.
Since the glossy surface is not easy to qualitatively paint, over fiberglass useful cheat sheet of writing paper. It is partially impregnated by resin during molding of the housing and after the wet grinding of the finished parts is almost entirely remote ensure is prepared for the painting surface.
The polymerization (forming) it is advisable to maintain at a pressure of 13 to 16 kgf/cm2, but excellent results can be obtained and are as follows: on top of writing paper, starting from the middle of the length of the mandrel, gently layer by layer, keeping the direction of coiling, with gradually increasing tension wound rubber medical bandage with a total thickness of 8 -10 mm. on Top of the rubber, also pulling as hard as you can and gently stroking the folds, place 4 — 5 layers uznogo gauze bandage.
Sequence of operations for manufacturing tubular housings for model rockets
The sequence of operations for manufacturing tubular housings for model rockets:
1 — coiling cable paper, 2 — winding fiberglass STP-4, 3 — winding layer of writing paper, 4 — rubber overlay tape 5 — wrapping of medical bandage, 6 — heat treatment (sintered glass).

In the manufacture of thin pipes are used the tubular mandrel. This allows you to enter the quartz heaters connected via Latr to the network, and to heat them to complete polymerization of the resin. The thick tubes are baked on the burner of a gas stove (hot air is supplied to the hole of the mandrel, positioned vertically above the plate, using a basic adapter). The temperature inside the mandrel should be in the range of 150— 190°C. the holding Time is from 30 to 40 minutes. Warm cocoon cooled to 70-80 C, remove all bandages, and the mandrel with the finished part is cooled from the inside running water. The shrinkage of the material of the mandrel and the tubular part can be easily removed from it. Now in your hands — lightweight, translucent processing, hard, upon impact, giving clear sound. It remains only to cut the pipe to length and soshlifovat from the surface of writing paper.
With the fabrication of flat sheet metal parts is no problem: the technology of their “baking” is similar to the production tubular. It should be noted that, in addition to enclosures for model rockets, according to this technology it is possible to do, and many other elements, starting with tubular (conical or cylindrical) details of enclosures for aircraft, automotive and boat and ending with the lightest rigid rods to drive the rudders all sorts of RC.
O. NOVOZHENOV, head of the society, M a s s

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