The problem of noise of operation of internal combustion engines exist in all types of modeling. The modelers of the upper boundary of the acceptable level of noise has long been accepted 80 dB (when exceeding this value the result immediately canceled) have increasingly measured the noise of the flying machines, especially RC, are cases of control “of holosystolic” of micromachines and the competition of avtomodelistov. Performance requirements for noise suppression tougher every year, probably close to the time when the point of maximum noise will be introduced in the competition rules for all classes.
But now most of the serial motors if any, and is supplied with silencer, only for the conformity of the product vague modern rules clearly talking about the need for a muffler and not a word about its effectiveness. Serial muffler the scheme closed empty volume with inlet and outlet nozzles considerable section. In this embodiment, the device is able at best only to the suppression of a narrow band of a broad frequency spectrum of the exhaust noise.