Stainles steel silencer for ZG38/S/SC for inverted installation of the engine
This three chamber silencer for the Titan ZG38 is fixed behind the firewall with the four motor mount fixing screws. This silencer will fit practically any model that can be fitted with the ZG?38. This type of fixing of the silencer is not only very simple because no extra parts are required to fit the silencer, but it has the added advantage that the silencer and engine are one integral unit, which prevents vibration induced failure to the silencer.
There is seldom enough room under the cowl with a ZG38 for a large enough and thereby effective silencer. The best answer is to fit the tank at the CG position where it belongs, then use the free space behind the firewall for the silencer. With the ZG 38 this method is ideal due to rear exhaust outlet. To obtain sufficient cooling, cut a hole in the firewall the same size as the cylinder and right up to the motor mount. Seal off the air outlet at rear of motor cowl and add ducting between the cowl front and firewall so that all air coming into the cowl is forced to go through the cylinder fins and out over the silencer.
This system of cooling will ensure that the hot rear side of the engine will also be cooled adequately, preventing any distortion and subsequent loss of power. This is a very serious problem with many large volume silencer bolted directly onto the cylinder preventing this essential all round cooling. The silencer compartment must be shut off from the fuselage with 4?mm thick Balsa sheet. Light Balsa wood has excellent insulating properties as well as being surprisingly heat resistant. It is totally unnecessary to cover the Balsa with Aluminium foil or similar. The cooling air exit with the minimum size of 30?mm x 120?mm is placed immediately in front of the Balsa dividing wall in the floor. To increase the suction effect glue a small triangular strip on the front outside edge of the opening.