ski-jump-design

Ski jump profile design based on the paper by Levy, Hubbard, McNeil, and Swedberg. Compiled to WebAssembly for use in the browser.

Usage

import init, { make_jump } from 'ski-jump-design';

await init();

const result = make_jump(15.0, 0.0, 20.0, 25.0, 0.5);
console.log(result.outputs.takeoff_speed);
// Access surface coordinates for plotting:
// result.slope.x, result.slope.y
// result.takeoff.x, result.takeoff.y
// result.landing.x, result.landing.y
// etc.

Parameters

| Parameter | Type | Description | |-----------|------|-------------| | slope_angle_deg | number | Parent slope angle in degrees (positive = downhill) | | start_pos | number | Distance along slope to start position (meters) | | approach_len | number | Approach/run-in length (meters) | | takeoff_angle_deg | number | Takeoff ramp angle in degrees | | fall_height | number | Desired equivalent fall height (meters, typically 0.1–1.5) |

Return Type

make_jump returns a JumpResult (see pkg/types.d.ts):

interface Surface {
  x: number[];
  y: number[];
}

interface JumpOutputs {
  takeoff_speed: number;
  flight_time: number;
  flight_distance: number;
  flight_height: number;
  snow_budget: number;
}

interface JumpResult {
  slope: Surface;
  approach: Surface;
  takeoff: Surface;
  landing: Surface;
  landing_trans: Surface;
  flight: Surface;
  outputs: JumpOutputs;
}

Citation

Levy, Dean, Mont Hubbard, James A. McNeil, and Andrew Swedberg. "A Design Rationale for Safer Terrain Park Jumps That Limit Equivalent Fall Height." Sports Engineering 18, no. 4 (2015): 227–39. https://doi.org/10.1007/s12283-015-0182-6

License

MIT — see LICENSE.