Traction Loss

Overview

The Traction Loss component is a 1-DoF system that uses a single actuator to simulate rear-end sliding (oversteer / loss of traction) by physically rotating the cockpit around a yaw axis. It is typically used as a supplementary component alongside a primary motion platform — the platform handles multi-axis motion while the Traction Loss actuator adds a dedicated, responsive yaw cue for oversteer.

The Traction Loss component uses a single linear actuator connected to a floating pivot that rotates the cockpit around a configurable center of rotation. This gives a fast, direct yaw sensation that is independent of the main platform’s yaw capability.

Getting Started

1. In the Sim Config tab, click the “+” tab to add a new component.
2. Select Traction Loss (1 DoF) from the dropdown.
3. Enter your actuator and pivot dimensions.

Configuration Parameters

Actuator Settings

• Travel (mm) — The total stroke distance of the actuator from fully retracted to fully extended.

Pivot Geometry

The Traction Loss system works by connecting a linear actuator between a fixed point on the base and a floating point on the cockpit. When the actuator extends or retracts, it rotates the cockpit around a center of rotation.

• CoR Offset (mm) — Center of Rotation offset. The distance from the yaw center of rotation to the origin point. A larger offset moves the rotation center further forward, which increases the sensation of rear-end sliding. A smaller offset places the rotation closer to the center of the cockpit.
• Actuator Fixed X (mm) — The X coordinate (left/right) of the actuator’s fixed mounting point on the base frame.
• Actuator Fixed Y (mm) — The Y coordinate (front/rear) of the actuator’s fixed mounting point on the base frame.
• Actuator Floating X (mm) — The X coordinate (left/right) of the actuator’s floating mounting point on the cockpit.
• Actuator Floating Y (mm) — The Y coordinate (front/rear) of the actuator’s floating mounting point on the cockpit.

Travel Limits

• Yaw (degrees) — Maximum yaw rotation in either direction. The default is ±5°. Even small angular values produce a noticeable sensation because the traction loss actuator moves quickly and directly.

Common Setups

Hexapod + Traction Loss

The most common configuration. The hexapod provides 6-DoF platform motion (including its own yaw), while the Traction Loss adds a separate, fast-reacting yaw cue specifically for oversteer and loss-of-grip events. The two yaw sources complement each other — the hexapod provides sustained yaw from cornering forces, while the Traction Loss provides the sharp, transient kick of the rear end breaking loose.

Note

When combining with a hexapod, the Traction Loss component claims the yaw axis separately. Ensure your output is configured to send the Traction Loss actuator data to the correct hardware.

Quad Post + Traction Loss

Adds yaw capability to a platform that otherwise only has heave, pitch, and roll. The Traction Loss actuator provides the only yaw motion, making it especially impactful.

Tuning Tips

• CoR Offset — A value around 400–600mm typically works well for car racing. Larger offsets make the rear-end slide feel more dramatic by placing the rotation point further ahead of the driver.
• Keep yaw limits conservative — ±3° to ±5° is usually sufficient. The Traction Loss actuator is fast and direct, so small angular movements feel substantial.
• Tune the Primary Cue yaw gain — The traction loss effect is driven by the yaw axis output from your motion profile. Adjust the yaw gain and smoothing in the Primary Cue to control how aggressively the traction loss actuator responds.
• Use Manual Control to verify — Sweep the yaw slider in Manual Control to confirm the actuator moves correctly and the rotation direction matches expectations.