# Blok DM-2M

> variant of the Blok D upper stage

**Wikidata**: [Q15895937](https://www.wikidata.org/wiki/Q15895937)  
**Source**: https://4ort.xyz/entity/blok-dm-2m

## Summary
The Blok DM-2M is a variant of the Blok D upper stage, used as a space tug on Soviet and Russian launch systems. It is designed to move payloads from a reference orbit to their final destination or onto interplanetary trajectories. The Blok DM-2M serves as an advanced iteration within the Blok D family, optimized for specific mission profiles.

## Key Facts
- GRAU Index: 11С861-01  
- Instance of: Space tug  
- Subclass of: Blok D  
- Used in: Soviet and Russian expendable launch systems  
- Function: Moves payloads between orbits or to interplanetary trajectories  
- Wikipedia coverage: lv (Latvian)  
- Wikidata description: Variant of the Blok D upper stage  
- Sitelink count: 1  

## FAQs

### Q: What is the Blok DM-2M used for?
A: The Blok DM-2M is used as an upper stage or space tug to transport satellites and other payloads from a low Earth orbit to higher orbits or interplanetary trajectories. It enhances the payload capacity and mission flexibility of launch vehicles.

### Q: How does the Blok DM-2M differ from the original Blok D?
A: The Blok DM-2M is a modified version of the Blok D, incorporating design improvements for better performance, reliability, or compatibility with newer launch systems. Specific upgrades may include changes to propulsion or avionics.

### Q: Which launch systems use the Blok DM-2M?
A: The Blok DM-2M has been used on Soviet and Russian expendable launch vehicles, particularly those derived from the Proton and Zenit families. Exact configurations depend on mission requirements.

## Why It Matters
The Blok DM-2M plays a crucial role in extending the operational capabilities of launch systems by enabling precise orbital insertion and interplanetary missions. As part of the Blok D lineage, which has supported major Soviet and Russian space achievements—including lunar and planetary probes—it represents a continuation of reliable upper-stage technology. Its function as a space tug allows heavier payloads to reach geostationary orbit or escape velocity without requiring the main booster to perform these tasks. This modular approach improves mission efficiency and versatility, making it essential for both commercial satellite deployment and deep-space exploration efforts.

## Notable For
- Being a specialized variant of the historically significant Blok D upper stage  
- Designed specifically for high-energy transfer missions and orbital maneuvers  
- Integration into key Russian launch systems for geostationary and interplanetary missions  
- Identified by the GRAU index 11С861-01, marking its official designation within military and aerospace documentation  
- Represents continued evolution of Soviet-era propulsion systems adapted for modern use  

## Body

### Overview
The Blok DM-2M is a derivative of the Blok D upper stage, developed for use in Soviet and later Russian space launch programs. It functions primarily as a space tug, facilitating the movement of payloads from initial parking orbits to final operational orbits or interplanetary trajectories.

### Technical Classification
- **Instance Of**: Space tug  
- **Subclass Of**: Blok D  
- **GRAU Index**: 11С861-01  

As a space tug, the Blok DM-2M provides critical post-launch propulsion capability, allowing greater flexibility in mission planning and increased payload delivery efficiency.

### Role in Launch Systems
The Blok DM-2M is integrated into multi-stage launch vehicles, typically serving as the final stage before payload release. It enables missions that require precise orbital positioning or escape from Earth's gravity well, such as placing communications satellites into geostationary orbit or launching probes toward other planets.

### Relationship to Broader Systems
- Part of the broader Blok D class—an upper stage series with decades of operational history  
- Utilized across various expendable launch systems originating in the Soviet Union and continued under Russia  
- Supports complex missions involving multiple burns over extended periods  

This continuity underscores its importance in maintaining legacy infrastructure while adapting to evolving technological demands.

### Documentation and Recognition
- Covered in Latvian-language Wikipedia  
- Recognized in Wikidata with limited cross-linking (sitelink_count: 1), indicating niche but defined technical recognition  
- Officially categorized based on functional and structural lineage rather than standalone development  

Its relatively narrow public-facing presence reflects its role as a specialized subsystem within larger rocket architectures.