HandbrakeAnalyzer - Rally Stage - Citroen C4 WRC
Handbrake technique analysis: timing, duration, steering coordination
Sample Data
| Attribute | Value |
|---|---|
| Source | motec |
| Category | rally_stage |
| File | /Users/mhild/src/durandom/racing/b4racing/packages/source-motec/tests/fixtures/telemetry-NGP-Car_5-Citroen_C4_WRC-Stage_230-20260122_130000.ld |
Available Channels: brake, clutch, distance, gear, lap_distance_pct, lat_accel, long_accel, pitch, position_x, position_y, position_z, raw_LB.brakeDiskLayerTemp, raw_LB.brakeDiskTemp, raw_LB.brakeWear, raw_LB.currentTyreSegment, raw_LB.dampingForce, raw_LB.deflectionVelocity, raw_LB.helperSpringActive, raw_LB.innerBumpDeflectionVelocity, raw_LB.outerBumpDeflectionVelocity, raw_LB.rollbarForce, raw_LB.segmentData[0].temperature, raw_LB.segmentData[1].temperature, raw_LB.segmentData[2].temperature, raw_LB.segmentData[3].temperature, raw_LB.segmentData[4].temperature, raw_LB.segmentData[5].temperature, raw_LB.segmentData[6].temperature, raw_LB.segmentData[7].temperature, raw_LB.springForce, raw_LB.strutForce, raw_LB.temperature, raw_LB.treadTemperature, raw_LB.wear[0], raw_LB.wear[1], raw_LB.wear[2], raw_LB.wear[3], raw_LB.wear[4], raw_LB.wear[5], raw_LB.wear[6], raw_LB.wear[7], raw_LF.brakeDiskLayerTemp, raw_LF.brakeDiskTemp, raw_LF.brakeWear, raw_LF.currentTyreSegment, raw_LF.dampingForce, raw_LF.deflectionVelocity, raw_LF.helperSpringActive, raw_LF.innerBumpDeflectionVelocity, raw_LF.outerBumpDeflectionVelocity, raw_LF.rollbarForce, raw_LF.segmentData[0].temperature, raw_LF.segmentData[1].temperature, raw_LF.segmentData[2].temperature, raw_LF.segmentData[3].temperature, raw_LF.segmentData[4].temperature, raw_LF.segmentData[5].temperature, raw_LF.segmentData[6].temperature, raw_LF.segmentData[7].temperature, raw_LF.springForce, raw_LF.strutForce, raw_LF.temperature, raw_LF.treadTemperature, raw_LF.wear[0], raw_LF.wear[1], raw_LF.wear[2], raw_LF.wear[3], raw_LF.wear[4], raw_LF.wear[5], raw_LF.wear[6], raw_LF.wear[7], raw_RB.brakeDiskLayerTemp, raw_RB.brakeDiskTemp, raw_RB.brakeWear, raw_RB.currentTyreSegment, raw_RB.dampingForce, raw_RB.deflectionVelocity, raw_RB.helperSpringActive, raw_RB.innerBumpDeflectionVelocity, raw_RB.outerBumpDeflectionVelocity, raw_RB.rollbarForce, raw_RB.segmentData[0].temperature, raw_RB.segmentData[1].temperature, raw_RB.segmentData[2].temperature, raw_RB.segmentData[3].temperature, raw_RB.segmentData[4].temperature, raw_RB.segmentData[5].temperature, raw_RB.segmentData[6].temperature, raw_RB.segmentData[7].temperature, raw_RB.springForce, raw_RB.strutForce, raw_RB.temperature, raw_RB.treadTemperature, raw_RB.wear[0], raw_RB.wear[1], raw_RB.wear[2], raw_RB.wear[3], raw_RB.wear[4], raw_RB.wear[5], raw_RB.wear[6], raw_RB.wear[7], raw_RF.brakeDiskLayerTemp, raw_RF.brakeDiskTemp, raw_RF.brakeWear, raw_RF.currentTyreSegment, raw_RF.dampingForce, raw_RF.deflectionVelocity, raw_RF.helperSpringActive, raw_RF.innerBumpDeflectionVelocity, raw_RF.outerBumpDeflectionVelocity, raw_RF.rollbarForce, raw_RF.segmentData[0].temperature, raw_RF.segmentData[1].temperature, raw_RF.segmentData[2].temperature, raw_RF.segmentData[3].temperature, raw_RF.segmentData[4].temperature, raw_RF.segmentData[5].temperature, raw_RF.segmentData[6].temperature, raw_RF.segmentData[7].temperature, raw_RF.springForce, raw_RF.strutForce, raw_RF.temperature, raw_RF.treadTemperature, raw_RF.wear[0], raw_RF.wear[1], raw_RF.wear[2], raw_RF.wear[3], raw_RF.wear[4], raw_RF.wear[5], raw_RF.wear[6], raw_RF.wear[7], raw_distanceToEnd, raw_driveLineLocation, raw_engineCoolantHeatState.temperatu, raw_engineTemperature, raw_footbrakePressure, raw_handbrakePressure, raw_raceTime, raw_radiatorCoolantHeatState.tempera, raw_steering, raw_vecAngularAccelerationCar.x, raw_vecAngularAccelerationCar.y, raw_vecAngularAccelerationCar.z, raw_vecAngularVelocityCar.x, raw_vecAngularVelocityCar.y, raw_vecAngularVelocityCar.z, raw_vecAvgAngularAccelerationCar.x, raw_vecAvgAngularAccelerationCar.y, raw_vecAvgAngularAccelerationCar.z, raw_vecAvgLinearAccelerationCar.x, raw_vecAvgLinearAccelerationCar.y, raw_vecAvgLinearAccelerationCar.z, raw_vecRelativeAngularAcceleration.x, raw_vecRelativeAngularAcceleration.y, raw_vecRelativeAngularAcceleration.z, raw_vecRelativeAngularVelocity.x, raw_vecRelativeAngularVelocity.y, raw_vecRelativeAngularVelocity.z, raw_vecRelativeLinearAcceleration.x, raw_vecRelativeLinearAcceleration.y, raw_vecRelativeLinearAcceleration.z, raw_vecRelativeLinearVelocity.x, raw_vecRelativeLinearVelocity.y, raw_vecRelativeLinearVelocity.z, roll, rpm, speed, speed_kph, speed_mph, steering, suspension_fl_travel, suspension_fr_travel, suspension_rl_travel, suspension_rr_travel, throttle, time, tire_pressure_fl, tire_pressure_fr, tire_pressure_rl, tire_pressure_rr, tire_temp_fl, tire_temp_fr, tire_temp_rl, tire_temp_rr, track_pct, velocity_x, velocity_y, velocity_z, vert_accel, yaw
Configuration
| Setting | Value |
|---|---|
| Slice Type | lap |
| Metadata Only | False |
| Required Channels | steering, time |
When to Use
- User asks about handbrake technique
- User wants to know if they're using handbrake correctly
- User asks about hairpin or tight corner technique
- User wants to improve rotation skills
Key Options
| Option | Description |
|---|---|
lap_selection | all |
quick_pull_threshold_seconds | Max duration for good technique (default: 0.5s) |
steering_window_seconds | Window to check for steering-first (default: 0.3s) |
Sample Output
Subjects Analyzed: 1
Default Threshold
Options: quick_pull_threshold_seconds=0.5
{
"metrics": [
{
"subject_id": "e240d0597bb22cc0",
"driver_name": "RSF driver",
"handbrake_count": 5,
"quick_pull_count": 0,
"steering_first_count": 4,
"technique_score": 0.48,
"quick_pull_pct": 0.0,
"steering_first_pct": 0.8,
"avg_duration_seconds": 2.5598888816546177,
"avg_steering_coordination": 0.9,
"technique_formatted": "48%",
"quick_pull_formatted": "0%"
}
],
"handbrake_events": {
"e240d0597bb22cc0": [
{
"distance_m": -0.0006026849732734263,
"time_seconds": 0.0,
"duration_seconds": 7.319921001801333,
"max_handbrake": 0.986801028251648,
"steering_at_pull": 0.027254255175590516,
"steering_delta": -0.0596463784724474,
"is_quick_pull": false,
"is_steering_first": false
},
{
"distance_m": 1235.6800537109375,
"time_seconds": 70.66432276406884,
"duration_seconds": 0.7500488313041274,
"max_handbrake": 0.9814299941062927,
"steering_at_pull": 0.724,
"steering_delta": 0.0,
"is_quick_pull": false,
"is_steering_first": true
},
{
"distance_m": 1238.68994140625,
"time_seconds": 72.18525511643554,
"duration_seconds": 2.5557219437029204,
"max_handbrake": 0.986312985420227,
"steering_at_pull": 0.724,
"steering_delta": 0.0,
"is_quick_pull": false,
"is_steering_first": true
},
{
"distance_m": 1249.25,
"time_seconds": 75.75493196171627,
"duration_seconds": 1.659830284089665,
"max_handbrake": 0.9914399981498718,
"steering_at_pull": 0.724,
"steering_delta": -1.448,
"is_quick_pull": false,
"is_steering_first": true
},
{
"distance_m": 1241.8499755859375,
"time_seconds": 78.13008659417932,
"duration_seconds": 0.5139223473750434,
"max_handbrake": 0.9875329732894897,
"steering_at_pull": -0.724,
"steering_delta": 0.497603018283844,
"is_quick_pull": false,
"is_steering_first": true
}
]
},
"metadata": {
"analyzer": "handbrake_analysis",
"title": "Handbrake Analysis",
"subjects_analyzed": 1
}
}
Metrics Summary
| Metric | Value |
|---|---|
| Subject: e240d0597bb22cc0 | RSF driver |
Strict Quick Pull
Options: quick_pull_threshold_seconds=0.3
{
"metrics": [
{
"subject_id": "e240d0597bb22cc0",
"driver_name": "RSF driver",
"handbrake_count": 5,
"quick_pull_count": 0,
"steering_first_count": 4,
"technique_score": 0.48,
"quick_pull_pct": 0.0,
"steering_first_pct": 0.8,
"avg_duration_seconds": 2.5598888816546177,
"avg_steering_coordination": 0.9,
"technique_formatted": "48%",
"quick_pull_formatted": "0%"
}
],
"handbrake_events": {
"e240d0597bb22cc0": [
{
"distance_m": -0.0006026849732734263,
"time_seconds": 0.0,
"duration_seconds": 7.319921001801333,
"max_handbrake": 0.986801028251648,
"steering_at_pull": 0.027254255175590516,
"steering_delta": -0.0596463784724474,
"is_quick_pull": false,
"is_steering_first": false
},
{
"distance_m": 1235.6800537109375,
"time_seconds": 70.66432276406884,
"duration_seconds": 0.7500488313041274,
"max_handbrake": 0.9814299941062927,
"steering_at_pull": 0.724,
"steering_delta": 0.0,
"is_quick_pull": false,
"is_steering_first": true
},
{
"distance_m": 1238.68994140625,
"time_seconds": 72.18525511643554,
"duration_seconds": 2.5557219437029204,
"max_handbrake": 0.986312985420227,
"steering_at_pull": 0.724,
"steering_delta": 0.0,
"is_quick_pull": false,
"is_steering_first": true
},
{
"distance_m": 1249.25,
"time_seconds": 75.75493196171627,
"duration_seconds": 1.659830284089665,
"max_handbrake": 0.9914399981498718,
"steering_at_pull": 0.724,
"steering_delta": -1.448,
"is_quick_pull": false,
"is_steering_first": true
},
{
"distance_m": 1241.8499755859375,
"time_seconds": 78.13008659417932,
"duration_seconds": 0.5139223473750434,
"max_handbrake": 0.9875329732894897,
"steering_at_pull": -0.724,
"steering_delta": 0.497603018283844,
"is_quick_pull": false,
"is_steering_first": true
}
]
},
"metadata": {
"analyzer": "handbrake_analysis",
"title": "Handbrake Analysis",
"subjects_analyzed": 1
}
}
Metrics Summary
| Metric | Value |
|---|---|
| Subject: e240d0597bb22cc0 | RSF driver |
Example Calls
How is my handbrake technique
analyze(analyzers='handbrake_analysis', event='...')
Analyzes handbrake timing, duration, and steering coordination
Generated from b4racing.analysis.analyzers.handbrake_analysis.HandbrakeAnalyzer