It appears that the model of the master of sports of the international class from Murmansk A. Carapina can rightly be considered the perfection of technique in the class of S1A and deserves a separate discussion.
Case first stage glued on a mandrel Ø 30 mm made of two layers of glass, of a thickness of 0.03 mm. In the upper part with a length of 25 mm parabolic shape, glued the balsa resistant frame, the face of which is fastened on top, cut a fiberglass tube with an inner Ø of 10.5 mm. This item is a connecting sleeve connecting steps. In the bottom of the hull glued ferrule, carved out of balsa for the mounting of MRD of the first stage. Bottom glue is inserted into the thread of the fastening system recovery steps. And on top of the cage is mounted tube-ognevoj Ø 4 mm CFRP. The upper end of ognevaya is embedded in a persistent frame.
Stabilizers (three of them) cut from the balsa plate with a thickness of 0,7 mm. the Lateral surface is reinforced with fiberglass. The stabilizers are mounted with epoxy at the butt.
The housing of the second stage — also a pipe made of fiberglass. At a distance of 48 mm from the lower edge glued resistant holder with two diametrically spaced holes Ø 1,5 mm for pin fixing MRD and for attachment of the tether fairing and rescue system. The design of the stabilizers is similar to the first stage. Fairing carved from basswood and has a drilling for attaching the halyard.
The recovery system includes two brake band of the Mylar film. In the first stage of its size 28X283 mm; tape is mounted outside on the housing and fixed with thread. The second is the size of 30X3200 mm to fit inside the case.
The mass of the model without MRD is equal to 13 g: first step 8 g, the second — 5, Kicks off “height” on two engines designed by A. Sparia (mrad A-3-Ø 11 mm, pulse to 1.5 N*the first step, and MRD-3-7 Ø 10 mm, pulse 3.5 N*second).
Launch preparation is carried out. In the first step insert the engine without retarder. Its upper end rests on the cut pipe-ognevaya, in which is placed a small amount of gunpowder. To avoid the spontaneous ejection of MRD counter it with a bamboo pin Ø 1.5 mm passing through the clip. Next, fold an accordion with a pitch of 11 mm brake band, pressed it to the body and tie with a thread drawn through the cage and the upper part of MRD.
Until it stops (length 46 mm) into the housing insert the second stage engine, the upper end of which a bamboo studs previously secured bracket of strips of fiberglass 6mm wide. The lower part of the MRD (skirt) remains free. Through the through hole of the housing of the second stage and the thrust holder is inserted into another pin, which fits over the loop of the tether, made of soft wire in the winding. The other end of the tether is attached to the fairing and through the shock — on the brake band. Before laying the streamer in the body are covered with talc, then put the wad and the fairing.
Connection steps — due to the tight fit of the skirt top MRD in the hub housing of the first stage. This part of the engine (the nozzle) should sit on the upper end of the tube-ognevaya.
Takes off the gas dynamic model with the type “Piston”. At a height of 25-35 m is a division of steps. At this point, expelling charge starting mrad burn through a thread holding the brake band and the gear is landing. And the second, received some momentum, rapidly goes up.
Rocket model of world champion Anatoly Carapina:
1 — cone, 2 — FAL, 3 — brake band of the second stage, 4 — the case of the second stage, 5 — absorber, 6 — resistant holder, 7 — arm, 8 — MRD the second step, 9 — regulator 10 — connecting tube, 11 — parabolic part of the body, 12 — resistant frame, 13 — tube-ognevo, 14 — the case of the first stage, 15 — stabilizer of the first level, 16 — clip MRD, 17 — the first stage engine, 18 — brake band, 19 — burn through the thread of the fixing tape.
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