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RD-191: Variants, Design & Development
The RD-191 (Russian: Ракетный Двигатель-191, romanized: Raketnyy Dvigatel-191, lit. 'Rocket Engine 191') is a high-performance single-combustion chamber rocket engine, developed in Russia and sold by Roscosmos. It is derived from the RD-180 dual-combustion chamber engine, which itself was derived in turn from the four-chamber RD-170 originally used in…
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RD-191 topic overview
The analysis highlights Variants, Design and Development as prominent areas in the source structure around RD-191.
Related topics
42
Source areas
4
Connected nodes
46
Extracted relationships
96
Concept neighborhoods
21
Bridge connections
46
What this topic covers Research coverage
Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.
Variants · 17 topics
Overview · 12 topics
Design · 7 topics
Development · 6 topics
Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.
Key facts & relationships
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Application
Main engine
Burn time
325 seconds (Angara A5 core stage)
Chamber pressure
25.8 MPa (3,740 psi)
Country of origin
Russia
Cycle
Oxidizer-rich staged combustion
Date
2001
Explore all related topics Closing gaps
A structured outline of related entities, concepts and subtopics. Open any item to build a new map centered on it.
Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
How RD-191 connects Entity context
Entity context groups extracted connections by relationship type. Counts show recurrence in the analyzed source; the examples are research signals, not claims about importance.
The extracted context around RD-191 shows recurring relationship patterns in the source. For example, RD-191 → AJ-26, AJ-26/Antares, Antares, CRS-1, December, February, International Space Station, It, January, July, March, May, Moon, N1F, NASA, NK-33, Northrop Grumman Innovation Systems, NPO Energomash, NPO Energomash RD-181, On Another extracted example is RD-191 → According, Angara-A5M, Angara-A5V, During, In May, India, July, L110, LVM-3, LVM3, NPO Energomash, RD-191M, Roskosmos, Russia, SCE-200, The, The RD-191M, This. Use these groups to spot repeated connection types before inspecting the individual relationships.
RD-191
Top relations
related to RD-181· 34
RD-191 → AJ-26, AJ-26/Antares, Antares, CRS-1, December, February, International Space Station, It, January, July, March, May, Moon, N1F, NASA, NK-33, Northrop Grumman Innovation Systems, NPO Energomash, NPO Energomash RD-181, On
related to RD-191M· 18
RD-191 → According, Angara-A5M, Angara-A5V, During, In May, India, July, L110, LVM-3, LVM3, NPO Energomash, RD-191M, Roskosmos, Russia, SCE-200, The, The RD-191M, This
related to Development· 13
RD-191 → Angara, Angara A5, Antares, By, In, In December, In July, NPO Energomash, On, Orbital Sciences, RD-181, September, The
related to RD-151· 5
RD-191 → August, July, RD-151, South Korean Naro-1, The
related to External links· 3
RD-191 → Archived, Energomash, July
Application· 1
RD-191 → Main engine
Burn time· 1
RD-191 → 325 seconds (Angara A5 core stage)
Chamber pressure· 1
RD-191 → 25.8 MPa (3,740 psi)
Country of origin· 1
RD-191 → Russia
Cycle· 1
RD-191 → Oxidizer-rich staged combustion
Important terminology
Frequent words and multi-word phrases across the lead, headings, infobox and body. Useful for terminology coverage.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
Relationships are represented as Subject → Predicate → Object triples. Confidence describes extraction strength, not the real-world importance of a relationship; lower-confidence rows may be contextual rather than explicit.
TTTA extracted 96 structured relationships around RD-191. Examples in this analysis include RD-191 → Application → Main engine and RD-191 → Burn time → 325 seconds (Angara A5 core stage). The table shows each extracted connection, where it came from and its confidence.
Subject
Predicate
Object
Confidence
Src
RD-191
Application
Main engine
1.00
infobox
RD-191
Burn time
325 seconds (Angara A5 core stage)
1.00
infobox
RD-191
Chamber pressure
25.8 MPa (3,740 psi)
1.00
infobox
RD-191
Country of origin
Russia
1.00
infobox
RD-191
Cycle
Oxidizer-rich staged combustion
1.00
infobox
RD-191
Date
2001
1.00
infobox
RD-191
Designer
NPO Energomash
1.00
infobox
RD-191
Diameter
1.45 m (4 ft 9 in)
1.00
infobox
RD-191
Dry mass
2,290 kg (5,050 lb)
1.00
infobox
RD-191
Gimbal range
8°
1.00
infobox
RD-191
Length
4 m (13 ft)
1.00
infobox
RD-191
Manufacturer
NPO Energomash / Proton-PM (in transition)
1.00
infobox
RD-191
Mixture ratio
2.6:1
1.00
infobox
RD-191
Nozzle ratio
37:1
1.00
infobox
RD-191
Predecessor
RD-170
1.00
infobox
RD-191
Propellant
LOX / RP-1
1.00
infobox
RD-191
Specific impulse, sea-level
310.7 s (3.047 km/s)
1.00
infobox
RD-191
Specific impulse, vacuum
337 s (3.30 km/s)
1.00
infobox
RD-191
Status
In use
1.00
infobox
RD-191
Throttle range
27–105%
1.00
infobox
RD-191
Thrust, sea-level
1,920 kN (430,000 lbf) at 100% throttle
1.00
infobox
RD-191
Thrust, vacuum
2,090 kN (470,000 lbf) at 100% throttle
1.00
infobox
RD-191
Thrust-to-weight ratio
89:1
1.00
infobox
No triples extracted yet.
Related concept clusters Concept neighborhoods
Concept neighborhoods group terms that sit near one another in the extracted graph. They are useful for discovering adjacent language and context, but proximity does not by itself imply a factual relationship.
The concept neighborhoods around RD-191 bring nearby vocabulary together. In this analysis, examples include Rocket, Rd-181 and Combustion. Use the clusters to find adjacent concepts and terminology that may deserve separate research.
RD-191
Rocket
Rd-181
Combustion
Lox
Chamber
Cycle
Russia
Thrust
Use
Engines
Orbital
Antares
rd-191
Rocket
Rd-181
Combustion
Lox
Chamber
Cycle
Russia
Thrust
Use
Engines
Orbital
Antares
rocket engine
Rd-191m
First
Launch
Engines
Orbital
Rocket
Angara
Russia
Antares
Npo
Tests
Energomash
npo energomash
Energomash
Npo
Rd-191m
Announced
Tests
Rd-181
Use
Engine
Rd-170
Lox
Nk-33
Russia
angara
Vehicle
Combustion
Lox
Rd-170
Engine
Burn
Chamber
Design
Rocket
Cycle
Russia
Stage
angara 1.2pp
Vehicle
Combustion
Lox
Rd-170
Engine
Burn
Chamber
Design
Rocket
Cycle
Russia
Stage
angara a5
Vehicle
Combustion
Lox
Rd-170
Engine
Burn
Chamber
Design
Rocket
Cycle
Russia
Stage
combustion chamber
Lox
Rd-170
Cycle
Russia
Rd-191
Burn
Combustion
Design
Also
Angara
Stage
Npo
Connections between topic areas Semantic bridges
Semantic bridges connect parts of the graph that would otherwise be more separate. A bridge is a structural signal in this analysis, not a claim that the two topic areas are equivalent.
For RD-191, one of the stronger structural bridges in this analysis connects RD-191 with Variants. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.
Number of nodes, edges, triples, density and central hubs. Use it to gauge the size and connectivity of the map.
RD-191
Nodes47
Edges46
Triples96
Avg. degree1.96
Density0.042553
Components1
Source & methodology
TTTA analyzes the structure around RD-191 to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Variants, Design & Development, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.
