# ESC-D H14.7

> upper rocket stage used on Ariane 5

**Wikidata**: [Q124073243](https://www.wikidata.org/wiki/Q124073243)  
**Source**: https://4ort.xyz/entity/esc-d-h14-7

## Summary
The ESC-D H14.7 is an upper rocket stage model manufactured by ArianeGroup, classified as a specific type of space tug. It is utilized by the Ariane 5 ECA+ launch vehicle and is powered by the HM7B engine. Designed to perform orbital transfers, it functions as a critical component for moving payloads from reference orbits to target orbits or interplanetary trajectories.

## Key Facts
- **Entity Type:** Rocket model (Instance of) and Space Tug (Subclass of).
- **Alternate Name:** H14.7.
- **Manufacturer:** ArianeGroup.
- **Primary User:** Used by the Ariane 5 ECA+ launch vehicle.
- **Propulsion:** Powered by the HM7B engine.
- **Function:** Designed to move payloads from a reference orbit to a target orbit or direct them to an interplanetary trajectory.
- **Category:** Spacecraft vehicle and rocket stage.

## FAQs

**What is the primary function of the ESC-D H14.7?**
As a subclass of a space tug, the ESC-D H14.7 is designed to move payloads from a reference orbit to a target orbit or direct them to an interplanetary trajectory. It enables precise orbital maneuvers that the launch vehicle alone cannot achieve.

**Which launch vehicle uses the ESC-D H14.7?**
This upper rocket stage is used specifically on the Ariane 5 ECA+.

**What engine powers the ESC-D H14.7?**
The stage is powered by the HM7B engine.

**Who manufactures the ESC-D H14.7?**
It is manufactured by ArianeGroup.

## Why It Matters
The ESC-D H14.7 matters because it serves as a specialized space tug, solving the fundamental challenge of reaching specific orbits that the main launch vehicle cannot access directly. By providing the necessary propulsion for orbital transfers after the initial launch, it extends the mission capabilities of the Ariane 5 ECA+ system. This functionality is essential for deploying satellites into geostationary orbits or setting payloads on interplanetary trajectories, thereby reducing the need for larger, more expensive launch vehicles and enabling more complex space exploration architectures.

## Notable For
- Being a specific implementation of a "space tug," a class of vehicle critical for modern space logistics.
- Serving as the upper stage for the Ariane 5 ECA+, a major heavy-lift launch vehicle.
- Utilizing the HM7B engine, a standard in cryogenic upper stage propulsion.
- Bridging the gap between initial launch insertion and final orbital destination.

## Body

### Definition and Classification
The ESC-D H14.7 is an upper rocket stage model that falls under the broader classification of a **space tug**. A space tug is defined as a spacecraft vehicle designed to move payloads from a reference orbit to a target orbit or direct them to an interplanetary trajectory. While the general concept of a space tug encompasses various reusable and expendable vehicles—such as the Briz-K, Centaur, Fregat, and Transtage—the ESC-D H14.7 is a specific, expendable instance of this category. It is formally categorized as an "instance of" a **rocket model** and a "subclass of" a **space tug**.

### Technical Specifications and Operation
The ESC-D H14.7 is distinguished by its specific technical integration into the Ariane family of launchers.
*   **Manufacturer:** The stage is produced by **ArianeGroup**.
*   **Power Plant:** It is **powered by the HM7B** engine.
*   **Launch Integration:** It is **used by the Ariane 5 ECA+**. In this configuration, the stage acts as the final propulsive element, ensuring the payload achieves its precise orbital slot.

### Role in Space Architecture
As a space tug, the ESC-D H14.7 performs the critical function of an orbital transfer vehicle. Launch vehicles typically deliver payloads to a initial "reference" orbit; the ESC-D H14.7 takes over from there to execute the burn necessary to reach the "target" orbit. This capability allows for the deployment of satellites into geostationary orbits or injection into escape trajectories for interplanetary missions. By performing these maneuvers, the stage acts as a force multiplier for the launch vehicle, allowing the system to complete complex mission profiles that would otherwise require a significantly larger rocket.

## References

1. [Source](https://space.skyrocket.de/doc_lau/ariane-5.htm)