Line tension in a wind

Code snippets

curl "https://api.oanor.com/kite-api/v1/line-pull" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/kite-api/v1/line-pull", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/kite-api/v1/line-pull");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/kite-api/v1/line-pull",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "The pull a kite puts on the line ≈ ½ × air density × wind speed² × sail area × a force coefficient (~0.8 for a typical flat/delta kite). It rises with the square of the wind, so doubling the wind quadruples the pull — a 1.5 m² kite holds about 47 N (nearly 5 kgf) at 8 m/s but four times that in a 16 m/s blow. Size the line and your grip to the gusts, not the average.",
        "inputs": {
            "air_density": 1.225,
            "kite_area_m2": 1.5,
            "wind_speed_ms": 8,
            "pull_coefficient": 0.8
        },
        "line_pull_n": 47.04,
        "line_pull_kgf": 4.797
    },
    "meta": {
        "timestamp": "2026-06-07T08:17:49.071Z",
        "request_id": "10855908-2268-4b8f-addb-24b2a6c51351"
    },
    "status": "ok",
    "message": "Line pull",
    "success": true
}