How do I install the Landing Gear Sizing skill?

Run npx skillmds@latest add ashfordeou/landing-gear-sizing 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.

Is Landing Gear Sizing safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Landing Gear Sizing?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Landing Gear Sizing free to use?

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

Who published Landing Gear Sizing?

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

Landing Gear Sizing by ashfordeou — Agent Skill

Name: Landing Gear Sizing
Author: ashfordeOU

Landing Gear Sizing

Use when you must size the landing gear for an aircraft at the sizing level: split the maximum landing weight over the struts, compute the nose and main gear loads from the CG position and the wheelbase, size the shock absorber stroke from the sink speed and the landing load factor, and check the tire rating margin. Produces the static loads, the required stroke, and a gear sized or tire overloaded verdict that gate the landing gear configuration. Trigger: landing gear, strut load, wheelbase, nose gear, main gear, shock absorber stroke, sink speed, tire rating, landing load factor.

ashfordeOU Updated Sep 17, 2026

File contents

Landing Gear Sizing (vehicle-design/sizing/landing-gear-sizing)

Use when the task is sizing the landing gear at the conceptual level: static loads over the struts, nose and main gear load share from the CG and wheelbase, shock absorber stroke, and the tire rating margin.

Domain quick reference

Static loads split the maximum landing weight over the struts; with the CG a distance aft of the main gear, static equilibrium about the main gear gives nose load = W * cg_aft / wheelbase and main load = W - nose load.
Shock absorber stroke follows from the energy balance 0.5mv2 = nmg*stroke, so stroke = v2 / (2ng) with g = 9.80665 m/s**2.
Tire rating margin is static load over tire rating; the rating covers the load when the margin is at most 1.0.
FAR-25.723 / CS-25.723 shock absorption verification is a drop test; this module provides the sizing-level energy check only.

Workflow

Collect the maximum landing weight, strut counts, CG position, wheelbase, sink speed, landing load factor, and tire rating.
Split the load with static_load_per_strut (even split) or main_gear_load_share (CG-based nose/main split).
Size the shock absorber with required_shock_stroke.
Check the tire with tire_rating_margin.
Close with landing_gear_verdict and gate on the verdict.

Pitfalls

Treating the sizing-level energy check as the certification drop test: FAR-25.723 / CS-25.723 verification is a drop test; this module is the sizing-level energy check only.
A CG aft of the wheelbase: the nose gear would carry negative load; the logic raises ValueError.
Non-positive weight, wheelbase, load factor, or tire rating: the logic raises ValueError.
Reporting the even-split load when the CG is far aft of the main gear: use main_gear_load_share for the CG-based split.
A tire margin above 1.0 means overload: the verdict is tire overloaded, not gear sized.

Behavior contract (gate 3)

The sizing logic is exercised by the gate 3 contract test: scripts/test_landing_gear_logic.py against scripts/landing_gear_logic.py (stdlib unittest, offline). Run:

python3 scripts/test_landing_gear_logic.py

Compliance

FAR-25 is US government work (public domain) and CS-25 is a free EASA download; standards referenced, not reproduced, per standards-map.yaml. Sizing methodology is common conceptual design practice.
compliance: STANDARDS-REF, gated: false.

---name: landing-gear-sizingdescription: Use when you must size the landing gear for an aircraft at the sizing level: split the maximum landing weight over the struts, compute the nose and main gear loads from the CG position and the wheelbase, size the shock absorber stroke from the sink speed and the landing load factor, and check the tire rating margin. Produces the static loads, the required stroke, and a gear sized or tire overloaded verdict that gate the landing gear configuration. Trigger: landing gear, strut load, wheelbase, nose gear, main gear, shock absorber stroke, sink speed, tire rating, landing load factor.license: Apache-2.0---# Landing Gear Sizing (vehicle-design/sizing/landing-gear-sizing)Use when the task is sizing the landing gear at the conceptual level:static loads over the struts, nose and main gear load share from theCG and wheelbase, shock absorber stroke, and the tire rating margin.## Domain quick reference- Static loads split the maximum landing weight over the struts; with the CG a distance aft of the main gear, static equilibrium about the main gear gives nose load = W * cg_aft / wheelbase and main load = W - nose load.- Shock absorber stroke follows from the energy balance 0.5*m*v**2 = n*m*g*stroke, so stroke = v**2 / (2*n*g) with g = 9.80665 m/s**2.- Tire rating margin is static load over tire rating; the rating covers the load when the margin is at most 1.0.- FAR-25.723 / CS-25.723 shock absorption verification is a drop test; this module provides the sizing-level energy check only.## Workflow1. Collect the maximum landing weight, strut counts, CG position, wheelbase, sink speed, landing load factor, and tire rating.2. Split the load with static_load_per_strut (even split) or main_gear_load_share (CG-based nose/main split).3. Size the shock absorber with required_shock_stroke.4. Check the tire with tire_rating_margin.5. Close with landing_gear_verdict and gate on the verdict.## Pitfalls- Treating the sizing-level energy check as the certification drop test: FAR-25.723 / CS-25.723 verification is a drop test; this module is the sizing-level energy check only.- A CG aft of the wheelbase: the nose gear would carry negative load; the logic raises ValueError.- Non-positive weight, wheelbase, load factor, or tire rating: the logic raises ValueError.- Reporting the even-split load when the CG is far aft of the main gear: use main_gear_load_share for the CG-based split.- A tire margin above 1.0 means overload: the verdict is tire overloaded, not gear sized.## Behavior contract (gate 3)The sizing logic is exercised by the gate 3 contract test:scripts/test_landing_gear_logic.py againstscripts/landing_gear_logic.py (stdlib unittest, offline). Run:python3 scripts/test_landing_gear_logic.py## Compliance- FAR-25 is US government work (public domain) and CS-25 is a free EASA download; standards referenced, not reproduced, per standards-map.yaml. Sizing methodology is common conceptual design practice.- compliance: STANDARDS-REF, gated: false.

Frequently asked questions