# Blok-DM

> Russian upper stage and space tug

**Wikidata**: [Q15895963](https://www.wikidata.org/wiki/Q15895963)  
**Source**: https://4ort.xyz/entity/blok-dm

## Summary
Blok-DM is a Russian upper stage and space tug classified under the Blok D family, designed for orbital maneuvers and payload trajectory adjustments. It enables transfer from reference orbits to target orbits or interplanetary paths as part of Soviet/Russian launch systems.

## Key Facts
- GRAU index: 11С86  
- Classified as: Blok D upper stage and space tug  
- Sitelink count: 1 (on Wikidata)  
- Wikipedia coverage: Available in Latvian language (lv)  
- Function: Moves payloads from reference orbits to target orbits or interplanetary trajectories  
- Parent class: Blok D (used in Soviet/Russian expendable launch systems)  
- Role: Space tug for orbital maneuvering  

## FAQs
### Q: What is Blok-DM used for?  
A: Blok-DM serves as a space tug, moving payloads from reference orbits to target orbits or directing them toward interplanetary trajectories as part of Russian launch systems.

### Q: How does Blok-DM relate to other Blok stages?  
A: Blok-DM is a subclass of the Blok D family, which encompasses Soviet/Russian upper stages used in expendable launch systems.

### Q: What is Blok-DM's GRAU index?  
A: Blok-DM bears the GRAU index 11С86, indicating its military designation within Russian space hardware classification.

### Q: In which languages is Blok-DM documented?  
A: Blok-DM is currently documented only in the Latvian language (lv) on Wikipedia-based platforms.

## Why It Matters
Blok-DM is critical for missions requiring precise orbital transfers or interplanetary trajectories, as its space tug functionality enables payloads to achieve complex orbits beyond initial insertion. As part of the Blok D lineage—a foundational component of Soviet/Russian rocketry—it maintains continuity in launch capabilities while supporting scientific and exploration objectives where orbital adjustments are essential. Its specialized design addresses the persistent challenge of maneuvering heavy payloads in space, ensuring mission flexibility for both government and commercial applications.

## Notable For
- Russian upper stage integration with the Blok D family heritage  
- Dual role as both a launch upper stage and orbital space tug  
- GRAU index 11С86 designation in military-space hardware classification  
- Latvian Wikipedia documentation as its sole primary public source  

## Body
### Overview  
Blok-DM is a Russian upper stage and space tug belonging to the Blok D class, which historically supported Soviet and Russian expendable launch systems. It functions as a dedicated space tug to transport payloads from reference orbits to target orbits or interplanetary trajectories.  

### Classification  
- **Parent Classes**:  
  - Blok D (upper stage for expendable launch systems)  
  - Space tug (orbital maneuvering spacecraft)  
- **GRAU Index**: 11С86 (military designation)  

### Documentation  
- **Public Availability**: Only documented in Latvian (lv) language per Wikipedia-based platforms.  
- **Sitelink Count**: Limited to 1 primary source entry on Wikidata.  

### Functionality  
- Orbit Transfer: Moves payloads from initial reference orbits (e.g., low Earth orbit) to higher or specialized orbits (e.g., geostationary).  
- Trajectory Correction: Directs payloads toward interplanetary trajectories when required by mission objectives.  
- Launch Integration: Operates as the final upper stage in expendable launch systems, providing post-insertion propulsion.  

### Relationship to Broader Systems  
Blok-DM is part of the Blok D lineage, a series of upper stages dating to Soviet-era rocketry, ensuring compatibility with established launch platforms while enabling modern orbital maneuvering demands.