WEAPONS AIR FIGHTERS

The followers of Cordoba modeling we offer today a selection of two closely-related within the meaning of materials. In the first of them tells of a very successful training model, which can successfully perform in the school competition in the class “air fight”. The second development deals with the creation of a serious sports equipment available for the average Modeler materials. Thus we will try to help beginners cordovil undergo a two stage improvement.

Sports training model

The advantages of the proposed development — stability and satisfactory control, low complexity of manufacturing and high strength like wings, and the whole “bouzouki” in General. Despite the relatively high specific load on the bearing surface, the model confidently piloted even if inaccurately-oiled engine or a low power last. Thus reinforced foam wing allows for almost continuous process of learning aerobatics — interim repairs after emergency landings not required.

Scheme training “bouzouki” is so simple that it requires no explanation — with its construction according to the attached drawings sharing-Antonov an. The only thing I would like to recommend: if possible, carry out the Assembly of the entire frame solely on the plasticized resin. It not only can boost your strength, but will increase the life of the model during fault-free operation.

Fig. 1. Cord uchebno-fighting model a engine working volume of 1.5—2.5 cm³:

1 — ending pine (4 mm), 2 — rib (pine 3 mm; after the treatment the external circuit to perform the window easier), 3 — the front edge pine (4×4 mm), 4 — filling of head (foam), 5 — shelf side member (pine 4×4 mm), 6 rocking chair (made of anodized aluminum with a thickness of 1,5—2 mm), 7 — pad (plywood 3-4 mm), 8 — bar motor (beech), 9 — compartment fuel tank 10 — wing (Mylar film or paper), 11 — back edge (pine 3×10 mm), 12 — weight (lead 15 g), 13 — pads for gluing the wing skin (Linden), 14 — fuselage (pine 10 mm), 15 — stabilizer (pine 3 mm) 16 — Elevator (pine 3 mm), 17 — Kiel (plywood 1.5 mm or celluloid), 18 — pull steering (OVS wire Ø 2 mm), 19 — pylon (aluminum with a thickness of 1 — 2 mm).

The figure shows several variants of wing structure. This is a classic set of frame without the foam elements, but with extra polynorborene (here a slight decrease in mass will be accompanied by a sensitive loss of strength); the replacement of the volume filling minimumage space of the forehead with foam pre-cut curved plate with a thickness of about 4 mm (with a slight decrease of mass strength will remain at the initial level, however, complicated the manufacture of the wing); and the transition to a different geometry of the wing — narrowing to the ends, while maintaining the source power circuit (increased complexity of manufacturing here completely kompensiruet as a decrease in mass and increase in relative strength).

 

Finally I would like to prevent possible attempts by designers to provide a model horizontal tail of the same area, but lower elongation. Of course, this event would gain mass or strength. However, leave main — good flight properties of the machine, largely justified by the use of knife-like stabilizer.

E. ANDREEV, G. kökshetaū

 

Sports model-“bouzouki”

 

A complete lack of balsa, simplicity, stability of flight in the complex with high controllability, versatility (can be used as “diesel” and “kalikai”) — here the main advantages of this design. The model is well matched to the motor a propeller fast enough. Tape speed is achieved 135-144 km/h. Weight “bouzouki” is also on quite an acceptable level — in the range of 420-470 g in take-off configuration.

 

Manufacturer model begins with the ribs of the wing, more precisely, their templates. Two exact templates, you can make any number of ribs for any number of wings, as they have no constriction and scope section constantly.

 

Of the six cut one of the wing ribs facilitate four and leave two for endings. The grooves under the rear edge, carry out using a jigsaw.

 

Fig. 2. Cord model for air combat under the engine working volume of 2.5 cm³.

 

Fig. 3. The main elements of the power set of the wing:

1 — foam head, 2 — contour profiling of the forehead, 3 — shelf side member (pine 5×5 mm), 4 — billet rib (Linden or pine thickness 2.5—3 mm).

 

Fig. 4. Revision of details of the engine KMD-2,5:

shortening the entire skirt of the piston is 2.5 mm high and a relief of the connecting rod by filing.

 

Fig. 5. Rocking control (aluminum, textolite or fiberglass).

 

Fig. 6. Tail node:

1 — the Central rib (Linden or pine with a thickness of 10-12 mm; manufactured to template ribs with no relief), 2 — screws, M3, 3 — square scarf (3 mm plywood), 4 — trailing edge (pine section 4х13 mm), 5 — plate “clothespin” (plywood 1.5 mm), 6 — boss (plywood 5 mm), 7 — hog (PCB), 8 — wheel height (Linden thickness of 3 mm).

 

Billet head from foam PVC brand connects with slatted shelves of the spar with white glue, which is going and the whole frame of the wing. Epoxy does not need or is applied only in the sub zone. Assembled wing vyshkurivaetsya, processed the profile of the forehead, followed by a close-fitting Mylar film by a known technology. The design of the tail clear of the drawings. Motor mount may be of any construction, the volume of the tank for “diesel” — 85 cm³.

Engine KMD can be modified in accordance with the figures of the recommendations, plus rassolova futorki carb up to Ø 5 mm. like this with a propeller Ø mm 180х125 the model can develop a speed of about 137 km/h with ribbon and 142 km/h without tape.

 

Very good result gives the fit scheme under nitro engine type CSTOM and 2.5 K. In this embodiment, heavy pine is replaced by lime, the forehead is made not from PVC but from melkosortnogo packaging foam with paper close-fitting its surface, is facilitated by the engine mount under the engine. All of these techniques in complex with a reduction in the carrier platform of the wing to 19.5 dm2 reduce take-off weight of 380-390 g. to the Mentioned engine with a propeller made of composite material “pull” model on the speed of 142 km/h with ribbon and up to 158 km/h without tape.

 

D. BELOGLAZOV, Chelyabinsk