FUEL TANK — CO2 | MODEL CONSTRUCTION

Whatever you say, but the popularity of a particular model often depends not on its flight data and… flight readiness. That is why many modelers prefer to equip their technique is not capricious and toxic internal combustion engines, and easy to operate electric motors, and carbon dioxide.

Readers Svobodnaya model airplane with carbon dioxide motor DP-03 with good flight characteristics with enough of its constructive and technological simplicity.

First, a few words about the power plant. DP-03 simple to operate pneumatic motor with a mass of 30 g, in which the engine speed reaches 2500 rpm.. a minimum time of operation on one filling of 30 C.

A model airplane is a high-wing aircraft with straight wings of large aspect ratio and large area, classic plumage and a box fuselage. By weight, geometrical and aerodynamic parameters is a glider, capable to make active the motor and subsequent, long-lasting gliding flights.

WING. The frame of the wing inlaid design with balsa ribs and edges and pine spars. Wing skin made of thin Mylar film.

One-piece wing, going from a pair of polycrylic consoles with the use of inserts made of 1 mm plywood. When docking polycrylic need to ensure that the angle V = 3°.

Ribs are the easiest to make in batches with the use of a pair of dural templates and stud bolts-cable ties — this will allow you to cut the workpiece quickly and with high precision.

Collect polycryl recommended stocks, which is a flat Board with pasted on it a drawing of a half-wing in 1:1 scale, protected by plastic film. To improve the accuracy of the Assembly on the slipway along the edges of the future wing nailed two strips (the distance between them is 110 mm).

Wing:

1 — Polonnaruwa (balsa, plate s1); 2 — beam flange (pine, battens 6×1,5); 3 — the sock (balsa rack 5×5); 4 — wing tip (balsa, plate s2); 5 — rib (balsa plate si); 6 — rear edge of the wing (balsa rail 10×3); 7,10 — insert (plywood s1); 8 — sewing Central part of the wing (balsa, plate s1); 9 — Central insert (plywood s1)

Svobodnaya model airplane with carbon-dioxide engine:

1 — engine DP-03; 2 — wing; 3 — fuselage; 4 — rear fairing (packing foam); 5 — vertical tail; 6 — sheathing of the keel (Mylar film); 7 — horizontal tail; 8 — wheel chassis; 9 — leaf spring suspension; 10 — front fairing (packing foam); 11 — gas cylinder; 12 — wing (Mylar film); 13 — trimming the horizontal stabilizer (Mylar film)

Fuselage:

1,3 — plating of Pilon (balsa, plate s1); 2 — trim the nose (balsa, plate s1); 4,13 — frames pylons (balsa, plate s2); 5 — frame rear fuselage (balsa plate s1,5); 6,7,8 — the covering of the fuselage (balsa, plate s1); 9 — boss (balsa); 10 — front frame (plywood, s3); 11 — the front wall of the pylon (balsa, plus Tina s2); 12 — pin (beech, rail d3); 14 — boss mount chassis (birch, rack 14×5); 15 — nut M3

Vertical tail:

1 — the ending of the keel (balsa); 2 — the leading edge (balsa rack 5×5); 3,4 — rib (balsa rack 5×5): 5 — the trailing edge of the keel (balsa rack 6×5); 6 — hinge (aluminum); 7 — rudder (balsa rail 15×5)

Horizontal tail:

1 — the ending of the stabilizer (balsa rack 5×5); 2 — trailing edge (balsa rail 6×3); 3 — the leading edge (balsa rack 5×5); 4 — shelf side member (pine, rail 5×1); 5 — rib (balsa, plate 1); 6 — solitaire (balsa, plate s1); 7— sewing the Central part of the stabilizer (balsa, plate s1)

Spring chassis

Wheel:

1 — “tire” (rubber ring or vinyl tape); 2 — hub (packing foam); 3 — bushing (part of refill gel ball pen); 4 — disk (plywood s1 )

First on the stocks of fixed pins front and rear edges of the wing, which saw blade blade pre made cuts at the ribs. Last mounted on epoxy glue whose viscosity should be such that when applying it to the joint edges, and the ribs form smooth fillet. If the viscosity of the glue, the excess can be reduced by addition of acetone. Please note that the first (from the plane of symmetry of the model) rib — cut and mounted on the wing after connecting polycrylic. After polymerization of the adhesive on the console are installed to the beam flange.

Ready console are joined in a single -wing with inserts from 1 mm plywood or two on the front and back edges and one Central, the insert between the shelves of the spar. Between the first ribs are glued to the so-called cladding 1 mm balsa.

The wing is fitted by a thin Mylar film on the glue BF-6 at the standard Noah model technology — using electric iron.

Fixed wing on the pylon rubber rings.

The FUSELAGE. Design it box type. The shell is glued balsa plates with thickness of 1.5 mm. from Inside the fuselage are balsa (1.5 mm thick) frames; the nose frame on which is mounted the engine, carved out of 3mm plywood. To assemble this fuselage convenient to the slipway — the Board that in accordance with the planned projection of the fuselage secured two blocks of wood in his path. First, on the slipway there are two balsa sides, and then in the pre-marked places glue the frames. After polymerization of the adhesive preform of the fuselage is removed from the pile, trimmed it and mounted the sides of the wing pylon (or if you want the sides of the cabin), lower panel balsa, birch lug mount chassis and beech pins attaching the wing.

At the end of the work on the fuselage are fixed front and rear Garg Rota wyrazenie of packing foam.

HORIZONTAL TAIL. The stabilizer is a flat plate with a rounded front and pointed rear edge. The design is almost the same as that of the wing, so gather its best as well as a wing on the Board-the slipway. The Central zone of the stabilizer is covered with 1 mm balsa. Cording — thin Mylar film on glue BF-6.

KIEL. The design of its stacked, balsa items tight of a thin Mylar film. The rudder, which controls the model celeberity, to the keel it is mounted on the aluminum portions of the hinges (it makes sense to use a material of beer cans).

CHASSIS — spring type. Spring curved sheet of aluminum with a thickness of 2 mm. Wheel is cut from foam PS; bushing wheels — cut refill gel ball pen, disks of 1-mm plywood, a “tire” made of rubber ring or, more simply, of a few turns of vinyl electrical tape. Axles of wheels — screws M2. The chassis is designed only for landing — takeoff model is carried out with it.

When assembling a model it is necessary to ensure alignment at 30 percent chord of the wing (33 mm from the front edge).

After the Assembly model balsa desirable elements of two coats of liquid nitro lacquer, then a layer of a medium. Assembled and painted model must have a mass of about 80 g.

Before starting you should carefully check the installation angles of the wing, engine, stabilizer and rudder. The first launches should be in non-motorized mode planning. If the model is stable in such a flight — not breaks down into a dive and not cabaret, then you can go to motor flight. This will require additional adjustments caused by the reaction of the propeller — will, most likely, bend the rudder, and put washers under the legs of the engine mount. The most rational trajectory of rise — an upward spiral.

I. SILVER,engineer

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