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title: "Its drawbacks stem from its advantages: the new engine makes the modification more expensive due to… — post author — DecisionGateway"
description: "statement by post author, recorded 2026-11-09 — verbatim quote and source citation."
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statementSaid on 2026-11-09

# **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.**

A statement by post author, said on 2026-11-09. Statements are as reported by the cited publishers — not verified by DecisionGateway.

> *Её недостатки проистекают из её преимуществ: новый двигатель делает модификацию дороже из-за необходимости окупания затрат на ОКР, он заметно более материалоёмок, и он же не позволяет распространить статистику успешных пусков «Союз-У» и «Союз-ФГ» на данную модификацию ракеты*

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

## **Discussion**

## **Related claims**

[**This modification is simpler (contains fewer elements) than 1a, owing to the use of a more advanced engine, and is capable of replacing 1a in all applications.**post author · statement](https://dgw.tmarket.io/claims/01a1d993-321b-7502-b9a4-ac621ce46d43) [**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.**post author · statement](https://dgw.tmarket.io/claims/01a1d993-31d2-7fa1-87fc-0c20ba05daaf) [**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) [**Diesel rose noticeably more than gasoline, increasing fuel costs for carriers, farmers and other businesses.**economyofarmenia · statement](https://dgw.tmarket.io/claims/01a1cd42-6f50-7289-85d6-b2427a76a6f4) [**Insufficient port readiness for mass bunkering of new fuels remains an important constraint.**DNV · statement](https://dgw.tmarket.io/claims/01a1d3c4-7b21-7841-9ae2-b97b97ba6687) [**The main obstacle to the new facility's development remains a shortage of feedstock; due to the relatively slow spread of electric vehicles in Japan, the volume of used batteries is still limited.**rustorgpred · statement](https://dgw.tmarket.io/claims/01a1b68b-ce88-791e-88b5-b7365b6314be)

[All claims](https://dgw.tmarket.io/claims)

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