Create Aeronautics: Constraint Fix
by duble
Create Aeronautics: Constraint Fix is a NeoForge library that repairs rope and spring constraints in airship structures copied through the Structure Block.
What it does
Structures that contain ropes and springs can come out glitched after they are copied with a Structure Block and loaded from an NBT file. The pasted build keeps pointing at the original location, so the engine destroys the strand while the connector still looks attached. This companion mod fixes that bug for Create Aeronautics. It runs on the server alone, so players join without installing anything. Builds exist for 1.21.1 on NeoForge.
Key features
Rope and spring repair
Ropes and spring connectors in copied airship structures are corrected so they hold their intended constraints.
Correct pasted coordinates
Pasted structures no longer point at the original build's coordinates, so the destroyed strand problem does not recur.
Visual anchors kept intact
Knots and anchors that looked attached now stay attached as working ropes and springs, instead of only appearing connected.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
In the catalog
Create Aeronautics: Constraint Fix is one of 3,514 Library mods on ModsFinder, and one of 1,449 Library mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
ConstraintFix is a small companion mod that repairs a critical bug affecting airships and any structure containing rope_connector, rope, spring_connector and spring blocks from Create Aeronautics. When the structure is pasted at a new location, those coordinates still point to the original build — the engine destroys…
Official listing
- Modrinth page
- modrinth.com/mod/create-aeronautics-constraint-fix
- Owner
- duble
- Published
- 2026-06-13
- Updated on Modrinth
- 2026-09-20
- Facts verified
- 2026-10-15