# Blok D

> upper stage used on Soviet and later Russian expendable launch systems

**Wikidata**: [Q219166](https://www.wikidata.org/wiki/Q219166)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Blok_D)  
**Source**: https://4ort.xyz/entity/blok-d

## Summary
Blok D is an upper stage used on Soviet and later Russian expendable launch systems. It functions as a space tug, designed to move payloads from a reference orbit to a target orbit or direct them to an interplanetary trajectory.

## Key Facts
- Blok D is an upper stage and space tug used on Soviet and Russian expendable launch systems
- It is classified as a rocket series and is a subclass of space tug
- The entity has 14 sitelinks across multiple language Wikipedias
- Blok D has several variants including Blok-DM, Blok-DM-SL, Blok DM-03, Blok DM-2, Blok DM-2M, and Blok-DM-SLB
- It has aliases in multiple languages including Bloc DM, Block D, and プロトン (ロケット)
- The entity has a Commons category and is documented in at least 10 Wikipedia languages

## FAQs
### Q: What is Blok D used for?
A: Blok D is an upper stage used on Soviet and Russian expendable launch systems. It functions as a space tug to move payloads from one orbit to another or direct them to interplanetary trajectories.

### Q: What are the variants of Blok D?
A: Blok D has several variants including Blok-DM, Blok-DM-SL, Blok DM-03, Blok DM-2, Blok DM-2M, and Blok-DM-SLB, each designed for specific mission requirements.

### Q: Is Blok D still in use today?
A: Blok D was developed for Soviet launch systems and has been used in Russian space programs, though specific current usage information is not provided in the source material.

## Why It Matters
Blok D represents a significant advancement in Soviet and Russian space technology as a versatile upper stage and space tug. Its ability to function as a space tug - moving payloads between orbits or directing them to interplanetary trajectories - made it crucial for complex space missions that required precise orbital maneuvers. The development of Blok D and its variants demonstrates the evolution of Soviet and Russian launch capabilities, allowing for more sophisticated mission profiles and expanding the range of achievable space operations. As a foundational technology in the Soviet and Russian space programs, Blok D has contributed to numerous space missions and helped establish the technical expertise that continues to influence modern space exploration efforts.

## Notable For
- Being a versatile upper stage that functions as a space tug for orbital transfers
- Having multiple variants (Blok-DM, Blok-DM-SL, Blok DM-03, Blok DM-2, Blok DM-2M, Blok-DM-SLB) for different mission requirements
- Serving as a key component in Soviet and Russian expendable launch systems
- Supporting interplanetary trajectory missions through its space tug capabilities
- Being documented across multiple language Wikipedias, indicating its significance in space technology

## Body
### Technical Classification
Blok D is classified as a rocket series and specifically as a space tug. As a space tug, it is designed to move payloads from a reference orbit to a target orbit or direct them to an interplanetary trajectory. This classification indicates its specialized function beyond simply being an upper stage.

### Variants and Development
The Blok D family includes multiple variants that have been developed over time:
- Blok-DM: A Russian upper stage and space tug
- Blok-DM-SL: Another Russian upper stage and space tug variant
- Blok DM-03: A specific variant of the Blok D upper stage
- Blok DM-2: A variant of the Blok D upper stage
- Blok DM-2M: Another variant of the Blok D upper stage
- Blok-DM-SLB: A Russian upper stage and space tug

### Documentation and Recognition
Blok D has significant documentation across multiple platforms:
- It has 14 sitelinks across various language Wikipedias
- The entity is documented in at least 10 Wikipedia languages including commons, de, en, fr, hi, hu, id, ja, lv, and pl
- It has a dedicated Commons category for media files
- The entity has specific aliases in multiple languages, including Bloc DM, Bloc DM-3, Bloc DM-2, Bloc DM-SL, Block D, Block DM, and the Japanese designation プロトン (ロケット)

### Technical Specifications
While specific technical dimensions are not provided in the source material, Blok D is described as an upper stage used on expendable launch systems. Its primary function as a space tug indicates it has propulsion capabilities sufficient for orbital transfers and trajectory adjustments.

## Schema Markup
```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Blok D",
  "description": "Upper stage used on Soviet and later Russian expendable launch systems",
  "url": "https://en.wikipedia.org/wiki/Blok_D",
  "sameAs": [
    "https://www.wikidata.org/wiki/Q15241312",
    "https://commons.wikimedia.org/wiki/Category:Blok_D"
  ],
  "additionalType": "rocket series"
}

## References

1. Freebase Data Dumps. 2013