statementSaid on 2026-11-09
In the Soyuz-2.1b launch vehicle, compared with the Soyuz-2.1a variant, the third-stage engine is the RD-0124 developed by KB Khimavtomatiki, with increased specific impulse up to 359 s and improved controllability through the ability to change the thrust vector of the main chambers instead of using low-efficiency steering nozzles on turbine exhaust ('crumpled') gas.
A statement by post author, said on 2026-11-09. Statements are as reported by the cited publishers — not verified by DecisionGateway.
В ракете-носителе «Союз-2.1б», по сравнению с вариантом «Союз-2.1а», в качестве двигателя третьей ступени используется РД-0124 разработки КБ Химавтоматики с повышенным удельным импульсом до 359 с и улучшенной управляемостью за счёт возможности изменения вектора тяги основных камер вместо применения малоэффективных рулевых сопел на затурбинном («мятом») газе.
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