JUST LIKE THE CHAMPIONS | MODEL CONSTRUCTION

Good modelers! Almost all of the many sports classes they have and the same subclass designed for students. Equipment from the “juniors” easier, more accessible, and to treat her in the competition much easier than with the “older” supermodels of today.

Much more difficult boys-modelers who have decided to engage seriously kordovye aerolister. The fact that the class B1 is missing a similar “Junior” division. And after class contour rezinomotornaya boats they have to immediately delve into the vast world problem championship equipment. And energy to overcome this “divide” is not enough for everyone. In addition, immediately raises questions about a suitable engine and the sound attenuation that can be solved only individually. It will not be the head of the circle to give the boy, not having virtually no experience, and the engine-the species Trichinella with a resonant pipe!

To fill the “vacuum”, we designed the model, originally designed for engine working volume of 1.5 cm³. The main parameters and the ratio of dimensions of the glider taken from the well-proven model championship class. Reducing the size according to the cubic capacity of the engine, thus we leave close to the same potential driving performance.

What is very important — the engines of the MK-17 “Junior” in the factory, accelerated performance when operating at maximum power have a noise level within 80 dB. This allows you to get rid of all of system noise and to simplify the construction and operation of the glider. In this case, all the parameters it stays within the rules of the competition and student may make such a model part in any official competitions. Of course, the speed at the “lorry” will be shown far from the record. However, how many times in the Junior Championships of different rank won’t superparty owner, and the owner of much more simple, but not whimsical in adjustment and reliable equipment!

Manufacturer aerolister of this type presents no special difficulties even for beginners. The base of the housing are upper and lower power panels, planed and sanded from high quality, well-dried Linden or aspen. After careful calibration of the cross section of these strips on a flat Board-the slipway is fixed arbitrarily billet plating the starboard side of the hull and applied directly at her pencil markings put on the glue panel. (The only meet the requirements of strength and water resistance of glue have to admit epoxy resin. So before you start Assembly works, it is necessary to acquaint the members with the rules of treatment with this adhesive.

The next operation is the mounting bosses together with the frames. In General you should strive to at a time to glue the maximum number of connections. In some cases it may be inconvenient, but the benefits of durability (it is known that fresh resin is already cured the bonding interface is unreliable) outweigh the other arguments.

Fig. 1. Cord airboat with the engine working volume of 1.5 cm3.

Fig. 1. Cord airboat with engine cylinder capacity of 1.5 cm³:

1 — building, 2 — propeller, 3 — engine (MK-17 “Junior” or MDS-1,5), 4 — fuel tank 5 — pole, 6 — rear bracket bridle, 7 — float, 8 — regulator, 9 — front bracket bridle.

Fig. 2. Body:

1 — the sole of the redan (thin aluminum or Micarta), 2 — base sole (aspen or basswood section 2,5X23 mm), 3 — fairing (Linden), 4, 7, 11 frames (plywood 2 mm, set in increments of 100 mm in body length), 5 — power panel (aspen or basswood section 2,5X23 mm for entire length), 6 — side casing (insulation thickness 0,7—0,8 mm), 8, the Central boss (Linden), 9 — screw M3 mounting pylon 10 — M3 screw of fastening of the stabilizer, 12 — rear boss (Linden), 13 — feed redan (Linden), 14 — transom (Linden thickness of 3 mm), 15 — side fairing-gain (lime).

Fig. 3. Float:

1 — bow boss (Linden), 2 — cover (cardboard), 3 — the ring (lip thickness of 2.5 mm), 4 — power side (Linden or aspen 2.5 mm thick).

Note that before installing Central boss easier to pre-seal it screws M3 for fixing the pylon. Then you won’t have to break the smooth surface plating starboard. The final operation is the grinding plane of the assembled frame and gluing the planking on the port side (it consists of two parts — front and back). After the adhesive has cured you can remove the case from the bench. Next, smooth out all the seams and imperfections and cover the surface of a model two-component parquet lacquer, liquid diluted with alcohol. The point of this work is that such a structure absorbs deeply into wood and cardboard, securely protecting the materials from moisture. Finally, there is a body paint, synthetic enamels and installation of the soles of the redan. At the time paint the protruding shanks of the screws protect wearing them on rubber tubes.

Pylon power plant, despite the constructive simplicity, is a very important and heavily loaded part. Therefore it should be treated with the utmost care. The Assembly of casings and bases it is best to spend at once, using a powerful clothes pegs. Usually recommended in the literature method of stitching “sandwich” small nails believe that it is absolutely unusable, as sooner or later even using putty the holes in the wood will be water and fuel. By the way on the protection of holes: after the complete processing of the pylon of the plant before applying parquet varnish to impregnate the inner surface of the holes svezhenakleennyh resin. After curing, drill holes in them to the desired size.

Fig. 4. Pilon:

1 — base (plywood of 4 mm), 2 — sheathing (plywood 1 mm).

Fig. 5. Fuel tank:

1 — body (sheet or tab sheet of plastic), 2 — kenensarivena tube O 3 mm, 3 — tube power of the motor.

Now it’s “wings” of the glider. Stabilizer if possible runs of sheet magnesium alloy, although not so heavy, and dural will be an option. In both cases, the thickness of the workpiece is selected in the range of 2 mm. in the absence of the materials the stabilizer is made of plywood or basswood in the thickness of 4-5 mm. Its surface and protect from water varnish only after docking with floats (together with them).

Floats by design, close to the body of the model. The only difference is that they force elements located above and below, and laterally. The cladding details are on glue. And bottom of serve in the Assembly again as the base, mounted on flat stocks, and the top put in last.

After carrying out the complete external decoration of all the major sites of the glider is carefully controlled by vzaimoporozhdeniya them on the assembled model. The floats need to be exactly parallel to the case, as the plane of the pylon, which are pressed against the legs of the crankcase. The axis of the propeller at least should not be directed up — otherwise very problematic launch, and stable ride on the water. The placement of both brackets of the bridle is adjustable, so that when the replacement engine and change its mass remained the condition of parallelism of the stabilizer surface area.

Speed characteristics of aeropittura, of course, depend primarily on engine power and efficiency of the propeller. For serial, is crude MK-17 is recommended propellers type 160Х170 mm. After reviewing the features of the model can move at a speed (150X180 mm). If you have successfully other service the engine, carefully rolled it on the bench and used as described earlier in “M-To” the rear wall of the housing at the same time with the transition to the fuel supply system pressure will further decrease the diameter of the screw at the same step. But we must take into consideration the danger to turn the maximum permitted engine noise at 80 dB.

V. VIKTOROV, the head of the circle

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