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Run npx skillmds@latest add ashfordeou/inertia-estimation in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Inertia Estimation free to use?

Yes. Installing skills from SkillMD is free. This skill is licensed under Apache-2.

Who published Inertia Estimation?

ashfordeOU (@ashfordeou) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Inertia Estimation by ashfordeou — Agent Skill

Name: Inertia Estimation
Author: ashfordeOU

Inertia Estimation

Use when you must estimate mass properties for vehicle design: compute moments of inertia from masses and radii of gyration, move inertia between axes with the parallel axis theorem, and check the gyration radius against the component dimension. Produces the inertia estimates, the parallel axis transfers, and the gyration sanity verdict that feed the loads analysis. Trigger: mass properties, moment of inertia, radius of gyration, parallel axis theorem, inertia estimation.

ashfordeOU c01c6f1 3 files · 5.8 KB Updated Sep 17, 2026

File contents

Mass Properties Inertia Estimation (vehicle-design/mass-properties/inertia-estimation)

Use when the task is mass properties estimation: moments of inertia, parallel axis transfers, and gyration radius sanity for the loads analysis.

Domain quick reference

Moment of inertia from the radius of gyration: I = m * k^2.
The parallel axis theorem moves inertia between axes: I = I_cg + m * d^2.
A gyration radius must lie inside the component dimension.
Mass properties feed the loads and dynamics analyses in the FAR-25 / CS-25 context.

Workflow

Collect component masses and radii of gyration.
Compute inertia with moi_gyration.
Transfer axes with parallel_axis.
Check the gyration radius with gyration_sane.
Feed the verified inertia set to the loads analysis.

Pitfalls

Using a gyration radius larger than the component.
Forgetting the mass times distance-squared term.
Mixing axes without the parallel axis theorem.

Behavior contract (gate 3)

The inertia, transfer, and sanity logic is exercised by the gate 3 contract test: scripts/test_inertia_estimation.py against scripts/inertia_estimation_logic.py (stdlib unittest, offline). Run: python3 scripts/test_inertia_estimation.py

Compliance

Standards referenced, not reproduced: FAR-25 is US government work (public domain) and CS-25 is a free EASA download; the inertia math is common mechanics, summary-only per standards-map.yaml.
compliance: STANDARDS-REF, gated: false.

---name: inertia-estimationdescription: Use when you must estimate mass properties for vehicle design: compute moments of inertia from masses and radii of gyration, move inertia between axes with the parallel axis theorem, and check the gyration radius against the component dimension. Produces the inertia estimates, the parallel axis transfers, and the gyration sanity verdict that feed the loads analysis. Trigger: mass properties, moment of inertia, radius of gyration, parallel axis theorem, inertia estimation.license: Apache-2.0---# Mass Properties Inertia Estimation (vehicle-design/mass-properties/inertia-estimation)Use when the task is mass properties estimation: moments ofinertia, parallel axis transfers, and gyration radius sanity forthe loads analysis.## Domain quick reference- Moment of inertia from the radius of gyration: I = m * k^2.- The parallel axis theorem moves inertia between axes: I = I_cg + m * d^2.- A gyration radius must lie inside the component dimension.- Mass properties feed the loads and dynamics analyses in the FAR-25 / CS-25 context.## Workflow1. Collect component masses and radii of gyration.2. Compute inertia with moi_gyration.3. Transfer axes with parallel_axis.4. Check the gyration radius with gyration_sane.5. Feed the verified inertia set to the loads analysis.## Pitfalls- Using a gyration radius larger than the component.- Forgetting the mass times distance-squared term.- Mixing axes without the parallel axis theorem.## Behavior contract (gate 3)The inertia, transfer, and sanity logic is exercised by the gate 3contract test: scripts/test_inertia_estimation.py againstscripts/inertia_estimation_logic.py (stdlib unittest, offline).Run:python3 scripts/test_inertia_estimation.py## Compliance- Standards referenced, not reproduced: FAR-25 is US government work (public domain) and CS-25 is a free EASA download; the inertia math is common mechanics, summary-only per standards-map.yaml.- compliance: STANDARDS-REF, gated: false.

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