How do I install the Accelerate Stop Distance skill?

Run npx skillmds@latest add ashfordeou/accelerate-stop-distance 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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Which AI agents work with Accelerate Stop Distance?

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Is Accelerate Stop Distance free to use?

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

Who published Accelerate Stop Distance?

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

Accelerate Stop Distance by ashfordeou

Name: Accelerate Stop Distance
Author: ashfordeOU

Accelerate Stop Distance

Use when you must compute the rejected takeoff accelerate stop distance for a flight test: accelerate the airplane to the decision speed V1, stop it with the braking deceleration, and check the total against the available runway length. Produces the accelerate distance, the stop distance, and the runway fits verdict that gate the rejected takeoff field length assessment. Trigger: rejected takeoff, V1 decision speed, braking deceleration, accelerate stop distance, runway length, balanced field length.

ashfordeOU 234be85 3 files · 9.7 KB Updated Sep 17, 2026

File contents

Accelerate Stop Distance (flight-test-operations/performance/accelerate-stop-distance)

Use when the task is rejected takeoff performance for a flight test: accelerate-stop distance from the decision speed V1, the braking deceleration, and the runway length verdict.

Domain quick reference

Speeds in m/s, accelerations in m/s^2, distances in m. The braking deceleration is the friction coefficient times g, 9.80665 m/s^2.
accelerate_distance: s_acc = v1^2 / (2 * a_acc), the accelerate leg from rest to the decision speed V1.
stop_distance: s_stop = v1^2 / (2 * a_brake), the stop leg from V1 with full braking and no reverse thrust.
accelerate_stop_distance: total = s_acc + s_stop; the balanced field length V1 is None in this simplified constant-acceleration model (no reaction time, no engine-out asymmetry).
runway_verdict: margin = runway_m - required_m; verdict is fits when margin >= 0, else too short.
Analytic check: v1 = 70 m/s, a_acc = 2.5 m/s^2 gives s_acc = 980 m; mu_b = 0.45 gives a_brake = 4.4130 m/s^2, s_stop = 555.17 m, total = 1535.17 m (2 dp).

Workflow

Collect the decision speed V1, the acceleration to V1, and the braking friction coefficient.
Derive the braking deceleration with brake_deceleration.
Compute the accelerate leg with accelerate_distance and the stop leg with stop_distance.
Combine both legs with accelerate_stop_distance.
Check the total against the available runway with runway_verdict and gate the rejected takeoff on the verdict.

Pitfalls

Using the accelerate distance as the total: the rejected takeoff field length is the accelerate leg plus the stop leg.
Forgetting that V1 is the decision speed in both legs: the stop leg starts at V1, not at the liftoff speed.
Mixing units: v1 in m/s with a_acc in m/s^2 gives distances in m; knots or ft/s need conversion first.
Reading a negative margin as an error: runway_verdict returns too short, which is a real, reportable rejected takeoff outcome.
Treating balanced_v1 as a computed value: this model returns None by design; balanced field length needs a full engine-out model.

Behavior contract (gate 3)

The accelerate-stop distance logic is exercised by the gate 3 contract test: scripts/test_accelerate_stop.py against scripts/accelerate_stop_logic.py (stdlib unittest, offline). Run: python3 scripts/test_accelerate_stop.py

Compliance

Standards referenced, not reproduced: FAR-25 (14 CFR Part 25) is US government work (public domain) and CS-25 is a free EASA download; the rejected takeoff accelerate-stop method is common flight-test methodology in the FAR 25.109 context, summary-only per standards-map.yaml.
compliance: STANDARDS-REF, gated: false.

---name: accelerate-stop-distancedescription: Use when you must compute the rejected takeoff accelerate stop distance for a flight test: accelerate the airplane to the decision speed V1, stop it with the braking deceleration, and check the total against the available runway length. Produces the accelerate distance, the stop distance, and the runway fits verdict that gate the rejected takeoff field length assessment. Trigger: rejected takeoff, V1 decision speed, braking deceleration, accelerate stop distance, runway length, balanced field length.license: Apache-2.0---# Accelerate Stop Distance (flight-test-operations/performance/accelerate-stop-distance)Use when the task is rejected takeoff performance for a flight test:accelerate-stop distance from the decision speed V1, the brakingdeceleration, and the runway length verdict.## Domain quick reference- Speeds in m/s, accelerations in m/s^2, distances in m. The braking deceleration is the friction coefficient times g, 9.80665 m/s^2.- accelerate_distance: s_acc = v1^2 / (2 * a_acc), the accelerate leg from rest to the decision speed V1.- stop_distance: s_stop = v1^2 / (2 * a_brake), the stop leg from V1 with full braking and no reverse thrust.- accelerate_stop_distance: total = s_acc + s_stop; the balanced field length V1 is None in this simplified constant-acceleration model (no reaction time, no engine-out asymmetry).- runway_verdict: margin = runway_m - required_m; verdict is fits when margin >= 0, else too short.- Analytic check: v1 = 70 m/s, a_acc = 2.5 m/s^2 gives s_acc = 980 m; mu_b = 0.45 gives a_brake = 4.4130 m/s^2, s_stop = 555.17 m, total = 1535.17 m (2 dp).## Workflow1. Collect the decision speed V1, the acceleration to V1, and the braking friction coefficient.2. Derive the braking deceleration with brake_deceleration.3. Compute the accelerate leg with accelerate_distance and the stop leg with stop_distance.4. Combine both legs with accelerate_stop_distance.5. Check the total against the available runway with runway_verdict and gate the rejected takeoff on the verdict.## Pitfalls- Using the accelerate distance as the total: the rejected takeoff field length is the accelerate leg plus the stop leg.- Forgetting that V1 is the decision speed in both legs: the stop leg starts at V1, not at the liftoff speed.- Mixing units: v1 in m/s with a_acc in m/s^2 gives distances in m; knots or ft/s need conversion first.- Reading a negative margin as an error: runway_verdict returns too short, which is a real, reportable rejected takeoff outcome.- Treating balanced_v1 as a computed value: this model returns None by design; balanced field length needs a full engine-out model.## Behavior contract (gate 3)The accelerate-stop distance logic is exercised by the gate 3contract test: scripts/test_accelerate_stop.py againstscripts/accelerate_stop_logic.py (stdlib unittest, offline). Run:`python3 scripts/test_accelerate_stop.py`## Compliance- Standards referenced, not reproduced: FAR-25 (14 CFR Part 25) is US government work (public domain) and CS-25 is a free EASA download; the rejected takeoff accelerate-stop method is common flight-test methodology in the FAR 25.109 context, summary-only per standards-map.yaml.- compliance: STANDARDS-REF, gated: false.

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