Silencer for model aircraft engine. Drawing, description

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Silencer for model aircraft engine. Tips for a modeler

Modeling

The new rules for holding competitions in the class of "air combat" models prohibit the use of glow engines without silencers. I bring to the attention of readers the most successful muffler developed by me for the TsSTKAM-2,5 engine. It consists of a collar, a silencing chamber, a bracket, a cover and M3 screws with spring washers.

The muffler is easy to manufacture, and its installation is preceded by only a slight refinement of the engine. To do this, the motor was disassembled, the crankcase was fixed in a mandrel and the cylinder head, together with the exhaust port, was machined to a diameter of 29 mm.

The most complex element of the muffler is the clamp. It is made from a piece of D16T grade duralumin 50x40x12 mm in size.

The center is marked on the workpiece and a hole with a diameter of 28,7 mm is bored. (If you make several sets at once, then it is better to process the clamps in a package of up to 5 pieces. The bored workpieces must be fixed on a special cylindrical mandrel with a diameter of 28,6 mm. Cut out a template for the outer contour of the clamp from a thin sheet material, put it on the mandrel and mark the upper workpiece on it. It is desirable to process the outer contour on a vertical milling machine, fixing the mandrel with a package of blanks in a vice. through groove in the clamping foot.)

For the silencing chamber, an electrolytic capacitor case of suitable dimensions was used. Its lower part is cut off on a lathe, and the body is cleaned of contents. Then, two holes with a diameter of 3,2 mm were marked and drilled in the bottom, and an exhaust window 12x6 mm in size was sawn out with a needle file.

Silencer for the TsSTKAM-2,5 engine (click to enlarge): 1 - clamp, 2 - silencing chamber, 3 - bracket, 4 - cover, 5 - Grover screw with washer

The cover is machined from D16T with one installation: first, the inner surface is processed, and then the outer surface.

Before assembly, the mating surfaces of the parts were thoroughly degreased with acetone, and then lubricated with silicone auto sealant. They also lubricated the screws that secure the silencer chamber to the clamp. For a reliable connection of the chamber and the cover, two holes with a diameter of 1,5 mm were drilled in them, through which a bracket of 1 mm copper wire was passed and riveted.

The muffler is mounted on the cylinder head with the clamp slightly unclenched for a while. And so that the exhaust window of the engine strictly coincides with the exhaust window in the clamp.

Due to the increased weight of the propeller installation, the engine had to be mounted near the leading edge of the wing of the model. To do this, a semicircular recess for the muffler was cut out in the wing forehead and pasted over with aluminum foil to prevent burnout of the skin.

The use of a silencer slightly reduced the effective power of the engine, therefore, in order to maintain the speed at the same level, a suitable propeller was selected.

Author: N.Bayazitov

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