---
title: "In the Soyuz-2.1b launch vehicle, compared with the Soyuz-2.1a variant, the third-stage engine is… — post author — DecisionGateway"
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  "og:title": "In the Soyuz-2.1b launch vehicle, compared with the Soyuz-2.1a variant, the third-stage engine is… — post author — DecisionGateway"
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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.*

babr24Published 2026-11-09 [ Read source](https://t.me/babr24/56601)

## **Discussion**

## **Related claims**

[**The Ministry of Defence of the Russian Federation showed video of the launch of the Soyuz-2.1b launch vehicle.**Минобороны РФ · statement](https://dgw.tmarket.io/claims/01a1d993-3187-73cf-acf5-1081dcc9727e) [**The use of a different type of propellant (RG-1 'naftil' kerosene instead of T-1 kerosene) led to a change in the ratio of the volumes of the loaded components and, as a consequence, to a redesign of the Block I structure.**post author · statement](https://dgw.tmarket.io/claims/01a1d993-31e9-7461-97bd-ebe3a592a640) [**Its drawbacks stem from its advantages: the new engine makes the modification more expensive due to the need to recoup R&D costs, it is noticeably more material-intensive, and it does not allow the successful launch statistics of Soyuz-U and Soyuz-FG to be extended to this modification of the rocket.**post author · statement](https://dgw.tmarket.io/claims/01a1d993-3232-740f-87b3-771287b5df2a) [**In September the Kazan aviation plant rolled out the third new Tu-214 to the flight-test station, another was in final assembly and the next in component assembly.**the post author · statement](https://dgw.tmarket.io/claims/01a1d9a2-dc2a-7287-bfad-c9bb225a642c) [**At SPIEF, Minister of Industry and Trade of the Russian Federation Anton Alikhanov said that four Tu-214s are planned for delivery in 2026 and the first of them has already been handed over for operation.**Антон Алиханов · statement](https://dgw.tmarket.io/claims/01a1d9a2-dbc2-751f-8164-f4445a0bc402) [**The fuel shock has created an opportunity for the fuel-efficient E2 jet.**巴西航空工業公司首席執行官 · statement](https://dgw.tmarket.io/claims/01a1d923-611b-7999-b4db-c287262cdd33)

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