H-IIA second stage
Shape built from published dimensions and pictures; details simplified.
Turn it in 3D
Open the 3D viewer (www.spaceradar.ai).
The viewer loads when you ask: about 700 kB the first time (three.js and the model), much less after.
Pictures 4
Three-quarter view
From the side
From behind
From above
About this model
H-IIA second stage is one of the 203 3D models Space Radar made itself: a rocket stage, built in code from published dimensions and photographs, with no image-to-3D generator and no one else’s mesh.
Shape built from published dimensions and pictures; details simplified. It has 13,700 triangles in a 82 kB glTF file, and is 9.2 m across at full scale.
It is part of the map’s library; no object on the live map is drawn with it today.
Dimensions and their sources
| Measure | Value |
|---|---|
| Length | 9.2 m |
| Diameter | 4 m |
Wikipedia, 'H-IIA' (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 (read 2026-10-26)
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).
The full record
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)
Where the map uses it. catalogue name H-2A R/B (klass rocket), which also reaches H-2A R/B(2): the H-IIA second stage with its LE-5B, 26 in orbit; public #1169
Licence note. The shape is this project's, under this repository's licence, built from published numbers (facts). Every picture it was compared with is listed under references; each was only looked at, none was traced, copied or projected, and the share-alike ones (CC BY-SA) are credited all the same.
References 4
What the shape was compared with. None of these pictures is in the file.
- H-IIA F34-2ndStage01Cabinet Office, Government of JapanCC BY 4.0 (Quasi-Zenith Satellite System website, Cabinet Office of Japan; Commons LicenseShortName, read 2026-10-26)
- H-IIA F35-2ndStage01Cabinet Office, Government of JapanCC BY 4.0 (Quasi-Zenith Satellite System website, Cabinet Office of Japan; Commons LicenseShortName, read 2026-10-26)
- H-IIA F36-2ndStage02Cabinet Office, Government of JapanCC BY 4.0 (Quasi-Zenith Satellite System website, Cabinet Office of Japan; Commons LicenseShortName, read 2026-10-26)
- H-IIA Family (Ofuku)OfukuCC BY 3.0 (Commons LicenseShortName, read 2026-10-26); looked at, nothing taken from it
Use it
The model is under the MIT licence: use it, change it and share it, in any project, also a paid one. Keep the credit:
H-IIA second stage 3D model by Space Radar (spaceradar.ai), MIT LicenseAny glTF 2.0 loader that reads meshopt compression (EXT_meshopt_compression) opens the file: three.js with its MeshoptDecoder, Babylon.js, model-viewer. Tools such as glTF-Transform can write an uncompressed copy.
Or embed the viewer in your page:
<iframe src="https://www.spaceradar.ai/model/?id=h2a-stage2" title="H-IIA second stage, 3D model by Space Radar" width="600" height="450" loading="lazy" style="border:0;max-width:100%"></iframe>Related models
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