Rotochute class S9N. Drawing, description

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Rotochute class S9N. Tips for a modeler

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The general interest at the competitions of rocket modellers (the first open championship of Asia and the championship of Russia) was caused by the model of the rotochute (class S9A) of the Russian athlete Vladimir Menshikov. Let's talk about it in detail. This model schematically resembles the development of the first rotochutes (1994-1996) at the dawn of this category. It was then that V. Menshikov proposed a similar option. But his current model is made at a higher technical and technological level. It does not belong to the type of container-type rotochutes. The body of the model consists of four blades made of balsa plates 1 mm thick. When folded along the axis of the model, each blade, or rather its width (chord), is 1/4 of the circumference, with a diameter of 40 mm.

Structurally, the rotochute model consists of three elements: the head fairing, the bearing rotor and the tail section (engine block).

The head fairing is molded from two or three layers of 0,03 mm thick fiberglass on an ogival-shaped mandrel with a slightly blunt top with a maximum diameter of 39,8 mm. After the binder has hardened, the fairing is cut in length to a size of 90 mm, faceted on a lathe, after which two annular frames (9, 10) of balsa 1 mm thick are glued: one at a distance of 50 mm, the other at a distance of 82 mm from the top of the model. The thickness of both frames is 6 mm. Four holes with a diameter of 1,2 mm are made above the upper frame and placed crosswise (diametrically). They serve to thread the return elastic bands. A crosspiece (10) is attached to the lower frame (12), sawn from fiberglass with a thickness of 0,5 mm, with four U-shaped hinged nodes for mounting the blades (11) glued along the edges. Holes 1 mm in diameter were drilled in the side walls of these assemblies to fix the axes of rotation of the blades.

A hole with a diameter of 5 mm is drilled in the center of the cross for gluing the suspension unit of the model.

Its base - a rod 170 mm long and 5 mm in diameter is made of carbon fiber. With its upper end (end), it will subsequently be glued on the "crown" of the head fairing. From below, a model suspension thread (28) and a container (14) are attached to it to accommodate an additional (stabilizing) tape. The container is a fiberglass tube with a diameter of 11 mm and a length of 40 mm. It connects to the rod through a bushing (27) machined from balsa. A frame (15) glued from two balsa plates is attached to the bottom of the container. It acts as a support when folding the blades. The rod and the head fairing are fixed by gluing it into its "crown" and into the sleeve (27) inserted into the container (14).

The main rotor of the model consists of four blades. They are made of balsa plate 1 mm thick. The balsa blank is pre-steamed, placed on a mandrel (preferably aluminum or plastic) and wrapped with a flat rubber band (to avoid dents). After drying, cut to a length of 330 mm and a width of 28 mm. Moreover, the sides (cut lines) should deviate from the center line of the mandrel by 4°. This is done in order to deliberately ensure the geometric twist of the blade.

S9N class rotochute model by V. Menshikov (Uray) (click to enlarge): 1 - head fairing; 2 - elastic opening of the blade; 3 - overlays; 4 - blade suspension rail; 5 - blade; 6 - motor block; 7 - stabilizer; 8 - fixator MRD; 9, 10, 15, 18 - frames; 11 - U-shaped bracket of the suspension unit; 12 - cross; 13 - rod head fairing; 14 - container; 16 - piston of the movable rod; 17 - movable rod; 19 - ribs of the blade; 20 - ending; 21 - half-rib; 22- clip; 23 - frame; 24 - suspension thread of the model; 25 - stabilizing tape; 26 - housing MRD; 27 - bushing (balsa); 28 - suspension thread

To the lower concave surface of the blades, 10 overlays (a kind of ribs) made of carbon fabric are glued. First, a cylindrical tube is formed on a mandrel with a diameter of 38 mm, which is then cut into rings 1,5 mm wide. Then they are cut into four segments (arcs). Glued on the blades, they provide their rigidity and the shape of one quarter of a circle. A lever is attached to one end of each of the blades, made of a lime rail 50 mm long and protruding beyond the cut (edge) of the blade by 5 mm. Its lateral sides are reinforced with celluloid and adjusted to the U-shaped hinge assembly of the head fairing. After that, a hole is drilled under the axis of rotation and the blade is hung. At a distance of 30 mm from the edge, the blade return elastic is fixed, tying a knot from below.

Balsa segments are glued to the tips (20) of the blades from the inside to form a connection node and fasten the propulsion unit. They are made like this. From a balsa veneer 0,8 mm thick (pre-wetted) on a mandrel with a diameter of 37 mm, a cylinder 20 mm long is bent. After drying, a ring 6 mm wide and 37 mm in diameter made of thin (0,3 - 0,5 mm) fiberglass is glued to any end. Then they are cut into four parts and attached to the blades (not in the drawing).

The engine block is the tail section of a conventional sports class rocket model. Its body is glued from two layers of fiberglass 0,03 mm thick on an ogive-shaped mandrel. After the resin has dried, the mandrel with the workpiece is clamped into the machine, processed and trimmed to a length of 125 mm. Three stabilizers made of 0,7 mm thick balsa are glued to the bottom edge. One of them is attached to the MRD retainer (8), curved from a steel wire with a diameter of 0,6 mm. A balsa connecting clip (22) with a width of 15 mm and a frame with an inner diameter of 32 mm are glued into the upper part. Along one of the stabilizers, the free end of the suspension thread of the model is attached. It is made of Kevlar, its length is about 1,5 m, its upper end is connected to a stabilizing brake band.

The preparation of the model for launch is carried out as follows. Check the correct mounting of the blades. Their angle "V" is about 5°, the tension of the return bands is the same. Then the stabilizing flight is rolled up and placed in a container, the blades are bent to the center and the propulsion unit is put on the connecting clip, which is formed by four elements at the free ends of the blades.

The starting weight of the rotoshute model without MRD is 17,5 g.

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