# H-IIA second stage 3D model

> Shape built from published dimensions and pictures; details simplified.

Free 3D model of H-IIA second stage, a rocket stage, built from published dimensions by Space Radar. 13,700 triangles, 82 kB glTF, MIT.

- **Class:** Rockets and stages
- **Mission:** Launch vehicles
- **Triangles:** 13,700
- **File:** h2a-stage2.glb, 82 kB, glTF 2.0 binary (meshopt)
- **Look:** Physically based
- **Size:** 9.2 m across
- **Made:** Built from dimensions
- **Added:** 2026-10-27
- **Download:** https://raw.githubusercontent.com/Sara-Managed-Projects/space-radar/main/site/models/h2a-stage2.glb
- **Mirror:** https://git.sara-agent.org/sara-projects/space-radar/raw/branch/main/site/models/h2a-stage2.glb
- **Viewer:** https://www.spaceradar.ai/model/?id=h2a-stage2
- **Licence:** MIT (https://github.com/Sara-Managed-Projects/space-radar/blob/main/LICENSE)
- **Credit:** H-IIA second stage 3D model by Space Radar (spaceradar.ai), MIT License

Canonical: https://models.spaceradar.ai/h2a-stage2/

## How it was made

Built in code from published dimensions and photographs, with no image-to-3D generator and no one else’s mesh. 3D model: built by Space Radar from published dimensions; compared with the Cabinet Office of Japan's photographs of H-IIA second stages (CC BY 4.0).

built by this project in code (tools/stage-builder/, release 1.4.0 stage r14-m1: stagelib.py and one function a stage in stages.py); no image-to-3D model was used and no published mesh: none of NASA 3D Resources' 1 583 paths is this stage and a web search found no agency or operator model of it (read 2026-10-26)

## Dimensions

- Length: 9.2 m
- Diameter: 4 m

Source: Wikipedia, 'H-IIA' (https://en.wikipedia.org/wiki/H-IIA), second-stage table read 2026-10-26: 'length 9.2 m', 'diameter 4 m', one LE-5B (the figures are JAXA's). OURS: the bell and its extension (1.6 m exit), the open skirt's height, the flange and vent loop's places, read off the Quasi-Zenith Satellite System website's photographs of F34 to F36

## References

- [H-IIA F34-2ndStage01](https://commons.wikimedia.org/wiki/File:H-IIA_F34-2ndStage01.jpg), Cabinet Office, Government of Japan (CC BY 4.0 (Quasi-Zenith Satellite System website, Cabinet Office of Japan; Commons LicenseShortName, read 2026-10-26))
- [H-IIA F35-2ndStage01](https://commons.wikimedia.org/wiki/File:H-IIA_F35-2ndStage01.jpg), Cabinet Office, Government of Japan (CC BY 4.0 (Quasi-Zenith Satellite System website, Cabinet Office of Japan; Commons LicenseShortName, read 2026-10-26))
- [H-IIA F36-2ndStage02](https://commons.wikimedia.org/wiki/File:H-IIA_F36-2ndStage02.jpg), Cabinet Office, Government of Japan (CC BY 4.0 (Quasi-Zenith Satellite System website, Cabinet Office of Japan; Commons LicenseShortName, read 2026-10-26))
- [H-IIA Family (Ofuku)](https://commons.wikimedia.org/wiki/File:H-IIA_Family.png), Ofuku (CC BY 3.0 (Commons LicenseShortName, read 2026-10-26); looked at, nothing taken from it)