Rocketplane class S4A. Drawing, description

MODELING
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Rocketplane class S4A. Tips for a modeler

Modeling

At first glance, the SA4 class rocket plane may seem primitive. But the ideas implemented in it deserve attention. And, in my opinion, they will be of interest to rocket modellers.

This model belongs to container-type rocket planes. Its gliding part is a miniature folding aircraft that fits into a carrier (container) for takeoff.

Rail-fuselage - a conical carbon fiber tube with a maximum diameter of 4 mm and a length of 304 mm, excluding the thickness of the frame. For her, the author adapted an ordinary whip (the thinnest link) from a folding fishing rod. The front part (large diameter) is glued into the frame of the head fairing. It is also conical in shape, glued together from thin pressboard (electrotechnical cardboard), the nose (“crown”) is carved from linden. The landing skirt with a width of 20 mm and a diameter of 31 mm is also made of pressboard and is connected to the head fairing by means of a frame cut from 1,5 mm thick plywood; seven holes are randomly drilled in it to facilitate it. The junction of the rail-fuselage and the frame is reinforced with a scarf. The container of the carrier rescue system is glued to the latter - a paper tube with a diameter of 9 mm and a length of 20 mm.

A.Sovkov's S4A class rocket plane model (click to enlarge): 1 - head fairing; 2 - "landing" skirt; 3 - rail-fuselage; 4 - wing mounting plate (consists of elements a, b, c); 5 - hook; 6 - elastic band for installing the wing; 7 - emphasis; 8 - front part of the wing; 9 - gum opening the wing (providing the angle "V"); 10 - gum opening elements of the wing; 11 - folding (rear) part of the wing; 12 - an emphasis of an elastic band of opening; 13 - swivel joint of the wing; 14 - frame of the head fairing; 15 - reinforcement scarf; 16 - carrier rescue system container; 17 - tail unit; 18 - gum opening plumage; 19 - hinge assembly plumage; 20 - plumage mounting plate; 21 - emphasis of the gum opening plumage; 22 - strip of fabric; 23 - pin-lock; 24 - carrier body; 25 - carrier stabilizer

The wing is rectangular in plan with trapezoidal tips. Manufactured - from a balsa plate 3 mm thick and 500 mm long. The wing profile is flat-convex. It is set when processing the entire plate with sandpaper glued to the bar. After that, the wing is covered with two layers of nitro-lacquer and cut into two halves (consoles), which, in turn, are cut lengthwise into two equal parts. The incision sites are lightly sanded, setting a small angle when joining, treated with nitro-lacquer and hinged, gluing strips of nylon fabric 12 mm wide along the lower plane. This sets some curvature of the profile (concavity). Two holes with a diameter of 2 mm are drilled in both halves of the console, departing from the fold line by 8 mm and 14 mm, respectively. They are threaded with double elastic bands for opening the wing and its elements (hat elastic with a diameter of 1 mm), which are held from below with a wire or bamboo hairpin.

The wing is connected into one piece using a mounting plate cut from plywood with dimensions of 8x23 mm and a thickness of 2 mm. From above, the hinge assembly (13) of the wing is attached to it. It consists of a U-shaped loop, of six turns of steel wire 0,8 mm in diameter with free ends 12 mm long and an axis inserted into the loop and bent in a U-shape. The ends of the axis 14 mm long are wrapped with threads, coated with epoxy resin and glued to the mounting plate. A piece of nylon fabric measuring 22x22 mm is glued to its lower surface.

After drying, the wing consoles are attached to the free ends of the fabric, gluing the fabric to the lower planes of its front parts (fixed). The "V" angle of the wing (about 7°) is set in this case by beveling the side planes of the board and is fixed with a rubber thread inserted into the console hole. The root ends of the consoles both above and below are reinforced with plywood overlays.

The free ends of the hinge assembly loop are tied with threads on epoxy resin to the fuselage rail from below at a distance of 34 mm from the cut of the "landing" skirt of the head fairing. To increase the contact surfaces of the wing, or rather the mounting plate, an overlay made of linden with a section of 6x9 mm is glued to it from above, making a groove at the point where the rail-fuselage touches. The thickness of the lining regulates the installation angle of the wing. From below, a hook is glued into the board at a distance of 11 mm from its front part for attaching the wing return gum. The second point of its fixation is on a hook fixed on top of the rail at a distance of 7 mm from the leading edge of the wing. This arrangement of the hooks creates the necessary moment of force to set the wing in a gliding position.

The tail unit is V-shaped, with a camber angle of 140°. Articulated mount - similar to the wing. Two balsa plates 1 mm thick are connected with a similar board using a strip of fabric, which, in turn, is pivotally attached from below to the tail section of the fuselage beam. The hinge assembly is similar to the wing attachment assembly and is made of wire with a diameter of 0,4 mm. The angle of installation of the tail unit is selected by the thickness of the lining glued on top of the board. In the planes of the tail unit at a distance of 14 mm from the edge, holes are made with a diameter of 2 mm for the elastic. Here is the original solution. An elastic band, the ends of which are fixed at the bottom with two studs, ensures both the opening of the stabilizer and its installation in position for planning.

Possible backlashes in the swivel are selected by elastic band tension.

The flight weight of the rocket plane is about 17 g.

Preparing the model for flight

First of all, when preparing the model for flight, the location of the center of gravity is found. It should be located 25 mm from the leading edge of the wing (slightly ahead of the folding line of the consoles). If not, load the nose or tail of the fuselage. Then they let the model go from hand to gliding, while achieving a stable flight with a small angle of descent. If the model dives, change the angle of the stabilizer, raising its rear part a little up. If she rolls, they let her go. This is done by selecting the thickness of the lining. Having achieved good planning, you can run the model on the engine with an impulse of up to 1 n s, achieving the desired result.

Authors: V.Rozhov, A.Sovkov, A.Smola

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