RECORD HOLDER… SIMPLICITY | MODEL CONSTRUCTION

If in the famous Guinness book of records recorded the simplicity and manufacturability, today we present to your attention a model would be the first contender for such a record. Especially attractive it is for young athletes. This model is a “bouzouki” with the engine working volume of 1.5 cm3. And all that will be needed for the manufacture of its frame, — a little more than five meters pine slats section 3X12 mm. They are easy to saw on the machine “Skillful hands”. The weight of the rails is about 100 G. Hence, with a relatively large wing area (dm2 21) it is easy to achieve a low specific loading and good maneuverability.

Unusual looks the leading edge is the spar with the corners-ribs (this part going first). Many intermediate developmental samples, I managed to find such an optimal scheme of the main frame element “lorry”. Bad aerodynamics profile! Flight tests do not confirm this. But try to instruct the boy to make such edge not corners-ribs and filling with Styrofoam! Glue on it it will go not less than the weight of the whole frame. It would be possible to whittle a solid powerful Reich! Yes, you can, if not amendments to the ineptitude of those boyish hands, as shown, the wings with solid edges never have a symmetrical profile on the most important part — the nose. We offer the same option edge easy to Assembly (like all other nodes on the epoxy resin), is lightweight and quite durable. Moreover, it is useful to prepare in advance a large number of T-shaped blanks. Some of them will go to the ending.

Fig. 1. Control line model airplane air combat under the engine working volume of 1.5 cm:

1 — ending 2 — ending reinforcements, 3 — solitaire (pine, 3 mm thick), 4 — front edge. 5, the spar 6 is an additional side bar, 7 — area-rib pine (thickness of 1 mm), 8 — weight (lead weight 15 g), 9 — a covering (Mylar film), 10 danladi (plywood with a thickness of 1 mm), 11 — tabs strengthen joint edges (pine, 3 mm thick), 12 — knot fastening tape 13 — “fin”, 14 — half of the Central rib 15 of the rib 16 and rear edge 17 — stabilizer. The details of the poses. 1, 2, 4, 5. 6, 13, 14 15 and 16 are made of pine slats section 3X12 mm

The Assembly of the frame is flat on discord Board or table, prolonged unnecessary piece of Mylar film with planted under her drawing in full size. All joints are adjusted as carefully as possible, smopu applied only after a careful quality control mutual adjustment of parts. After curing of the adhesive mounted under engine elements and control system, the sharp corners of the edges are slightly rounded and the frame is prepared for cording.

R and S. 2. The Elevator:

A — foam option: 1 — bezel made of pine slats are 1X4 mm, 2 — front edge of a pine Renn 4X4 mm, 3 — foam plate, 4 mm thick, 4 — panel behind the horn. 5 — the rear edge of the 1X4 pine slats mm, plating — from thin paper white glue;B — telefonerna option (shown in NZ made of plywood thickness of 2.5—3 mm, preparation of plywood in the thickness 1,5—2 mm

First, the film is superimposed on the bottom part of the wing, then upstairs. For pridurki film use an iron preheated to the minimum temperature. They smooth out the dried for 0.5— 1 hour adhesive joints of BF-2. Useful after finishing stitched to give the model “otvisetsya” a couple of days (and better, if you have enough patience, a week!]. During this time the wood “get used” to the effects of tightening efforts from the film and she’ll loosen the tension — and then become clear whether you need to fix the stretch or twist of the wing.

Fig. 3. Options fuel tank:

A tank for beginners; 1 — copper tube 0 3 mm feed motor, 2 — copper tube 3 0 mm of drainage and fill the tank with fuel, the free end of the output in the district futorki carb. 3 — low pattern tank,4 — screws M2,5 mounting tank in model 5 — the tip of the pattern of the tank. The pattern of the tank cut out of tinplate with a thickness of 0.3 mm, soldering tin-lead solder;B — tank for the sport models (item numbers and parts conform to version “A” tube POS. 2 is used to sum up the boost pressure of the cavity tank. Tank dimensions 20X40X70 mm, a volume of approximately 50 cm3);And polyethylene tank for sport models; 1, 2 — regular cover and tube vial, 3 — copper tube filling and drainage or pressurization. 4 — flexible rubber hose, 5 — “load” of cut copper tube, 6 plastic bottle from under detergents production GDR volume of 50 cm3, 7 — rubber ring fixing bottle. 8 — tool tray made of lime, 9 — screw M2,5 mounting cradle on the model 10 — the clove hitch rubber rings.In any case, the tank is pressed with screws M2,5 to the model through the rubber washers, ø 20 mm cut from a sheet thickness of 1 mm.

The wheel height is carried out after complete installation of all elements of the “bouzouki”, until the engine propeller. This will allow a precise adjustment of weight and the design of the steering, depending on engine (its mass) and the required alignment of the apparatus. Latest — within 65 mm from the front edge of kripa (of course, from the edge of the profile!], the DPJ beginners it is recommended that this dimension be reduced to 45 mm. Equipped with a micro motor MK-17 “Junior” and home-made wooden propeller (with it the behavior of the model much better than with regular plastic) d 180 mm and increments of 100— 130 mm, “bouzouki” perfectly piloted on cords d of 0.3 mm and a length of 10 m. the Symmetry of the motor in both forward and reverse figures are making, exposing its height by changing the thickness of gasket under engine. The spray hole of the nozzle should fall exactly on the middle height of the tank. This is easier to achieve when using coercive power when the fuel is supplied under pressure pumped into the tank from the crankcase of the engine. In this embodiment, the regular overlay threaded the carb is removed.

R and S. 4. Central power node of the set of wings:

1 — sub strip (birch), 2 — top plate (plywood with a thickness of 1 mm), 3 — tube d 3,5X0,5 under the screws on the tank, back at the same time — axis rocking (wrap the threads with a layer of glue in the center rib on the epoxy resin), 4 — half of the Central rib, 5 — bottom plate (plywood with a thickness of 1 mm). 6 — longerany set, 7 — area-rib, 8 — leading edge, 9 — bar fairing (lime, 12 mm thick), u — bars engine mounts (birch, 12 mm thick).

Note that the model of this class with the motor raised slightly above the axis of the wing behaves almost identically in both forward and reverse evolutions!

About other details. Thrust rudder are segments of knitting needles, rocking thrust — freed from braid guitar string (the seventh string without winding has a d of 0.5 mm], flexible cable is in tension the rocking — core from a cable shutter release of the camera. From the guides, springs, to seal in the ending. From strings can be done in many ways, microturbine, lock the DPJ which are segments of thin plastic tubes.

Fig. 5. Details of the control system;

1 — rocking chair (solid aluminum alloy with a thickness of 1,5—2 mm), 2 — tube caps (stainless steel or brass to extrude into the holes of the rocking and resciniti),3 — termination rod (wire OVS 0 1.2 mm), 4 — thrust (solid aluminum wire 0 2-2. 5 mm), 5 plastic tube-clamp, 6 — pylon (high impact plastic), 7 — lining (plastic), 8 — loop (wire OVS 0 0,8—1 mm), 9 — the junction of winding thin copper wire (solder), 10 — spacer (wire of the allied d 0.4 — 0.5 mm), 11 — a flexible reed 12 — eyelet (wire OVS d 0.5 mm) a 13 — carbine (allied wire, d 0.5 mm), 14 — a spring-guide (to glue on the epoxy in the wing tip).

Thin plywood is in the sub node can be replaced by a cemented two-three layers of insulation IPI planed thin fake plates. And for the parts of the hog will go to any plastic box with right angles. All wooden parts of the motor are covered with several layers of nitrocellulose lacquer in which is dissolved a little castor oil.

Fig. 6. Propeller DLV engine MK-17 “Junior” (d 180 mm, pitch 130 mm, material — birch, hornbeam or beech).

Manoeuvring characteristics of the model will increase significantly if you install the light engine with front-wheel distribution (“swift”) and to facilitate the Elevator. The model was ablatives and at high speeds — nitro micromotor. Even in this case it proved to be quite durable, enduring. Oddly enough, “bouzoukia” with faceted contour of the front part of the profile is not podnimayutsya at sharp evolutions, does not seek to fly in a circle.

A. DARA. The head of a circle of aircraft modeling

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