. The engines of the rocket "Angara" RD-191 have an opportunity At the start to destroy it, measures to combat this problem doesn't always work, told in NPO "Energomash" - engine manufacturer. When thrust is less than 38% in the engines of Angara starts, low-frequency oscillations, which have the ability "to cause resonance and structural failure of the launch vehicle," according to the document. To resolve features in the engine design introduced a special valve." determined that this method makes it possible to substantially minimize the amplitude of oscillations, "" but one way or another, on separate instances of the engine marks the manifestation of low frequency oscillations When working at low modes, from which we can summarize that the effect of the application of the three-position valve has the ability to be different on different instances of the engine ", - reported in the document. thus, concluded the Experts, the problem of eliminating low-frequency oscillations remains valid. "Angara" - a family of environmentally friendly carrier rockets of different classes. It includes light vehicles " Angara-1. 2 ", average " Angara-A3 ", heavy "Angara-A5" (modification of " п░5п° "- modernized) missiles and high-duty " Angara-п░5п▓ ". Now there was only one launch heavy rocket "Angara-A5" in 2014. The next launch scheduled from the beginning for 2016, now scheduled for the end of 2019. <span style="color:darkgray