IN THE AIR “SCHEMATICA”

IN THE AIR Elegant appearance, ease of fabrication, lack in construction materials in short supply, good flight characteristics are qualities that distinguish a schematic model of the airframe designed in the laboratory of aviation technology rut of Kazakhstan. Such models young Almaty residents repeatedly became winners of various competitions. Maximum results in all rounds is not uncommon when using the proposed “schematicity”. And flight characteristics of the glider was so high that it had to be equipped with a matchlock device forced landing. Without it, many models disappeared in terms.
Building a “little schematicity” begins with the wing. First of all billet bent edges (front edge only on V, the posterior for V and a narrowing of the end sections of the wing) with a specially made fixture. Before laying in a pine slats locations of future “fractures” moistened. To speed up drying, all heated on a hotplate.
 
Rubber-band attachment on the fuselage and hook for attachment of a wick device. An important task facing the young athletes at these stages, to achieve the minimum weight of Kai stabilizer and fin.
 
Fig. 1. Schematic model of the airframe
Fig. 1. Schematic model of the airframe:
1 — the forward part (birch or pine 8 mm thick), 2 — the rake of the fuselage (pine 8X8 mm), 3 — pole (pine 8 mm thick), 4 — hook (OBC d 1.5 mm, solder on tin base), 5 — keel (aluminum wire 0 2.5 mm), 6 — rib keel (Sosna 3X4 mm), 7 — rudder (cardboard), 8 — a covering (Mylar film 0.02 mm), 9 — sakaizawa stabilizer (aluminum wire 2.5 mm d), 10 — edge of the stabilizer (pine SX X4 mm), 11 — rib stabilizer pine 2X3 mm), 12 — rear edge of the pine 4X7 mm), 13 — rib (pine 2×3,5 mm), 14 — ending (aluminum wire d 2.5 mm), 15 — timing edge pine (4X7 mm), 16, 19 — details of the lodgment of the stabilizer, 17 — rubber thread, 18 — hook stabilizer (OBC d 1 mm), 20, 23 — hooks hanging wick device (OVS d, 1 mm), 21, 22 — the elements of a wick device 24 thread limit deflection of the stabilizer, 25 — back lining.
 
The fuselage of the glider — pine rail cross section 8X8 mm. of Its tail part on the length of about 500 mm, gradually narrowed to 6X6 mm. To the front end of the rack attached bow “tip”, cut from birch or pine plate. The item becomes finished after cleaning with fine emery paper, followed by coating (“treatment”) with aniline dye and lacquered enamel. Then glued to the fuselage lift pads under the stabilizer hook and the hinge of determinator.
 
The keel is bent from aluminum wire, flattened in places of joints with the beam of the fuselage. At the bottom of the rasper is inserted pine rack is the rib for fastening the lower portion of the skin. The keel is fixed to the fuselage with thread.
 
R and p. 2. The contours of the pole and ribs
R and S. 2. Outlines of pole and rib:
 
Tow hook — cut with a hot wire d 1.5 mm. It is soldered to the tin plate, bent lengthwise in the form of a small channel (on the fuselage rail).
 
Fig. 3. Recessed sableye for bending edges
Fig. 3. Recessed sableye for bending the edges:
And bending the front edge,B is the bending of trailing edges.

 
Ready wings, stabilizer and fin are upholstered in transparent or colored Mylar film with a thickness of 0.02 mm CA glue BF-6. “Weld” of the film to the frame is conveniently performed by means of an electrosoldering iron with a power of 50 W, bluenose for a voltage of 150 V. the tip is useful to wear dural nozzle with a diameter of about 40 mm. the accessory will allow you to warm up the trim to get a good tension of the film. The keel is covered on both sides, after which it glued a cardboard rudder.
 
At all stages of the Assembly need to ensure that there are no distortions of the consoles of the wing and rudder. Ready “themagicke” balance. The center of gravity of the glider should be at 1/3 of the Central chord of the wing. If necessary, the nose of the fuselage DeGroat pieces of lead.
 
Fig.4. Device for bending workpieces ribs
Fig.4. Device for bending workpieces ribs.
 
After alignment of the airframe with rubber bands (the same holds the wing pylon) to the fuselage privinchivayut and tow hook. It should be located at a distance of 18 mm in front of the center of gravity.
 
If, when debugging the flight is found that the model exhibits a tendency to nose dive under the rear edge of the stabilizer it is necessary to place a piece of veneer. When you pitch up (after starting the model nose up) the same way lifted front nrama. Final balancing is completed when a glider will “learn” steadily and smoothly to plan.
 
S, GLADKOV, head of the laboratory.

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