How do I install the Stall Speed Determination skill?

Run npx skillmds@latest add ashfordeou/stall-speed-determination 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 Stall Speed Determination safe to use?

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Which AI agents work with Stall Speed Determination?

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 Stall Speed Determination free to use?

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

Who published Stall Speed Determination?

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

Stall Speed Determination by ashfordeou

Name: Stall Speed Determination
Author: ashfordeOU

Stall Speed Determination

Use when you must determine the reference stall speed Vs1g for a flight test: derive it from the wing loading and the maximum lift coefficient, correct it for a weight change, and check the stall margin against the current flight speed. Produces the Vs1g reference stall speed in m/s, the weight-corrected stall speed, and the stall margin verdict that gate the performance assessment. Trigger: Vs1g, stall speed, wing loading, stall margin, flight test, weight correction.

ashfordeOU e3f5374 3 files · 7.2 KB Updated Sep 17, 2026

File contents

Stall Speed Determination (flight-test-operations/performance/stall-speed-determination)

Use when the task is stall speed determination for a flight test: reference stall speed Vs1g from wing loading and maximum lift coefficient, weight correction, and stall margin checks.

Domain quick reference

Wing loading W/S is in N/m^2, air density rho in kg/m^3, and speeds in m/s.
Vs1g = sqrt(2*(W/S)/(rho*CLmax)) is the 1g reference stall speed.
Stall speed scales with the square root of the weight ratio: V_new = Vs1g*sqrt(W_new/W_ref).
Stall margin = (V_current - Vs1g)/Vs1g; a negative margin means the current speed is below the reference stall speed.

Workflow

Collect the wing loading, air density, and maximum lift coefficient.
Derive the reference stall speed with vs1g.
Correct for the weight change with weight_corrected_stall_speed.
Check the stall margin with stall_margin.
Gate the flight test on the margin verdict.

Pitfalls

Using Vso instead of Vs1g: Vso is the stalling speed in the landing configuration at maximum weight, not the 1g reference stall speed.
Correcting weight with linear instead of sqrt scaling: stall speed scales with the square root of the weight ratio, not the ratio itself.
Misinterpreting a negative stall margin: it is not an error; a current speed below Vs1g is a real, reportable stall-onset risk.

Behavior contract (gate 3)

The vs1g, weight correction, and stall margin logic is exercised by the gate 3 contract test: scripts/test_stall_speed.py against scripts/stall_speed_logic.py (stdlib unittest, offline). Run: python3 scripts/test_stall_speed.py

Compliance

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

---name: stall-speed-determinationdescription: Use when you must determine the reference stall speed Vs1g for a flight test: derive it from the wing loading and the maximum lift coefficient, correct it for a weight change, and check the stall margin against the current flight speed. Produces the Vs1g reference stall speed in m/s, the weight-corrected stall speed, and the stall margin verdict that gate the performance assessment. Trigger: Vs1g, stall speed, wing loading, stall margin, flight test, weight correction.license: Apache-2.0---# Stall Speed Determination (flight-test-operations/performance/stall-speed-determination)Use when the task is stall speed determination for a flight test:reference stall speed Vs1g from wing loading and maximum liftcoefficient, weight correction, and stall margin checks.## Domain quick reference- Wing loading W/S is in N/m^2, air density rho in kg/m^3, and speeds in m/s.- Vs1g = sqrt(2*(W/S)/(rho*CLmax)) is the 1g reference stall speed.- Stall speed scales with the square root of the weight ratio: V_new = Vs1g*sqrt(W_new/W_ref).- Stall margin = (V_current - Vs1g)/Vs1g; a negative margin means the current speed is below the reference stall speed.## Workflow1. Collect the wing loading, air density, and maximum lift coefficient.2. Derive the reference stall speed with vs1g.3. Correct for the weight change with weight_corrected_stall_speed.4. Check the stall margin with stall_margin.5. Gate the flight test on the margin verdict.## Pitfalls- Using Vso instead of Vs1g: Vso is the stalling speed in the landing configuration at maximum weight, not the 1g reference stall speed.- Correcting weight with linear instead of sqrt scaling: stall speed scales with the square root of the weight ratio, not the ratio itself.- Misinterpreting a negative stall margin: it is not an error; a current speed below Vs1g is a real, reportable stall-onset risk.## Behavior contract (gate 3)The vs1g, weight correction, and stall margin logic is exercised bythe gate 3 contract test: scripts/test_stall_speed.py againstscripts/stall_speed_logic.py (stdlib unittest, offline). Run:python3 scripts/test_stall_speed.py## Compliance- Standards referenced, not reproduced: FAR-25 is US government work (public domain) and CS-25 is a free EASA download; the stall speed method is common flight-test methodology, summary-only per standards-map.yaml.- compliance: STANDARDS-REF, gated: false.

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