How do I install the Wind Effects skill?

Run npx skillmds@latest add ashfordeou/wind-effects 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 Wind Effects 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 Wind Effects?

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 Wind Effects free to use?

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

Who published Wind Effects?

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

Wind Effects by ashfordeou — Agent Skill

Name: Wind Effects
Author: ashfordeOU

Wind Effects

Use when you must resolve the wind triangle for a fixed-wing aircraft: decompose the wind into the headwind, tailwind, and crosswind components along the track, combine the true airspeed with the wind components to find the groundspeed, derive the wind correction angle needed to hold the track against the crosswind, and convert a leg distance into the enroute time at the resulting groundspeed. Produces the wind components, the groundspeed, the wind correction angle, and the enroute time that gate the wind effects assessment. Trigger: headwind, crosswind, wind correction angle, crab angle, groundspeed, enroute time, wind triangle.

ashfordeOU 5771837 3 files · 9.8 KB Updated Sep 17, 2026

File contents

Wind Effects (flight-mechanics/performance/wind-effects)

Use when the task is the wind triangle for flight planning: wind components along the track, groundspeed from true airspeed and wind, the wind correction angle to hold the track, and the enroute time from the resulting groundspeed.

Domain quick reference

Wind components along the track: with delta the angle from the track to the wind direction, the headwind component is hw = W * cos(delta) and the crosswind component is xw = W * sin(delta); positive hw slows the aircraft and positive xw is a crosswind from the right. Wind direction is the direction toward which the wind blows, degrees true.
Groundspeed from the wind triangle: GS = sqrt(TAS^2 - XW^2) + HW. The square root keeps the ground track constant while the aircraft crabs into the wind.
Wind correction angle (crab angle) in degrees: WCA = asin(XW / TAS).
Enroute time is the leg distance divided by the groundspeed: t = d / GS.
Units: speeds in m/s (or knots consistently), angles in degrees, distance in meters, time in seconds. Wind effects sit in the FAR-25 / CS-25 transport flight planning context.

Workflow

Collect the wind speed and direction, the track, and the true airspeed.
Decompose the wind into headwind and crosswind components with wind_components.
Combine the components with the true airspeed into the groundspeed with groundspeed.
Derive the wind correction angle with wind_correction_angle.
Convert the leg distance into the enroute time with enroute_time.

Pitfalls

Using the meteorological convention where the wind direction is the direction FROM which the wind blows; this skill takes the direction TOWARD which it blows, so convert by adding 180 degrees first.
Adding the full crosswind into the groundspeed; the wind triangle uses the square root so the track stays constant.
A crosswind at or above the true airspeed; the track cannot be held and groundspeed and wind_correction_angle raise ValueError.
Mixing m/s with knots inside one equation; keep every speed in the same unit.

Behavior contract (gate 3)

The wind triangle logic is exercised by the gate 3 contract test: scripts/test_wind_effects.py against scripts/wind_effects_logic.py (stdlib unittest, offline). Run: python3 scripts/test_wind_effects.py

Compliance

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

---name: wind-effectsdescription: Use when you must resolve the wind triangle for a fixed-wing aircraft: decompose the wind into the headwind, tailwind, and crosswind components along the track, combine the true airspeed with the wind components to find the groundspeed, derive the wind correction angle needed to hold the track against the crosswind, and convert a leg distance into the enroute time at the resulting groundspeed. Produces the wind components, the groundspeed, the wind correction angle, and the enroute time that gate the wind effects assessment. Trigger: headwind, crosswind, wind correction angle, crab angle, groundspeed, enroute time, wind triangle.license: Apache-2.0---# Wind Effects (flight-mechanics/performance/wind-effects)Use when the task is the wind triangle for flight planning: windcomponents along the track, groundspeed from true airspeed andwind, the wind correction angle to hold the track, and theenroute time from the resulting groundspeed.## Domain quick reference- Wind components along the track: with delta the angle from the track to the wind direction, the headwind component is hw = W * cos(delta) and the crosswind component is xw = W * sin(delta); positive hw slows the aircraft and positive xw is a crosswind from the right. Wind direction is the direction toward which the wind blows, degrees true.- Groundspeed from the wind triangle: GS = sqrt(TAS^2 - XW^2) + HW. The square root keeps the ground track constant while the aircraft crabs into the wind.- Wind correction angle (crab angle) in degrees: WCA = asin(XW / TAS).- Enroute time is the leg distance divided by the groundspeed: t = d / GS.- Units: speeds in m/s (or knots consistently), angles in degrees, distance in meters, time in seconds. Wind effects sit in the FAR-25 / CS-25 transport flight planning context.## Workflow1. Collect the wind speed and direction, the track, and the true airspeed.2. Decompose the wind into headwind and crosswind components with wind_components.3. Combine the components with the true airspeed into the groundspeed with groundspeed.4. Derive the wind correction angle with wind_correction_angle.5. Convert the leg distance into the enroute time with enroute_time.## Pitfalls- Using the meteorological convention where the wind direction is the direction FROM which the wind blows; this skill takes the direction TOWARD which it blows, so convert by adding 180 degrees first.- Adding the full crosswind into the groundspeed; the wind triangle uses the square root so the track stays constant.- A crosswind at or above the true airspeed; the track cannot be held and groundspeed and wind_correction_angle raise ValueError.- Mixing m/s with knots inside one equation; keep every speed in the same unit.## Behavior contract (gate 3)The wind triangle logic is exercised by the gate 3 contract test:scripts/test_wind_effects.py against scripts/wind_effects_logic.py(stdlib unittest, offline). Run:python3 scripts/test_wind_effects.py## Compliance- Standards referenced, not reproduced: FAR-25 is US government work (public domain) and CS-25 is a free EASA download; the wind triangle is common navigation and flight planning methodology, summary-only per standards-map.yaml.- compliance: STANDARDS-REF, gated: false.

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