Recovery Force Estimation
Recovery force depends on terrain, slope, and vehicle condition.
In difficult conditions, required force can exceed the vehicle’s weight.
Quick Reference
Start with Gross Vehicle Weight (GVW), then apply:
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Terrain resistance – increases rapidly in mud, sand, or loose ground
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Slope resistance – increases when recovering uphill
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Vehicle condition – locked axles, dragging, or flats significantly increase resistance
Real-World Ranges
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Hard ground: 10–30% of GVW
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Loose terrain: 30–50% of GVW
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Mud / severe conditions: 75–150%+ of GVW
Add minimum 20% safety margin
Multiple resistance factors combine and can exceed estimates quickly.
Critical Safety Point
Recovery loads are not constant.
Shock loading, suction, and load shift can rapidly increase force beyond calculated values.
Always select equipment rated above expected load.
Detailed Terrain Factors (Advanced)
Multiply GVW by factor below to calculate terrain drag:
Terrain Type |
TRF |
|---|---|
| Soft Wet Sand | 0.20 |
| Loose Gravel / Dry Sand | 0.25 |
| Light to Moderate Mud | 0.33 |
| Deep Mud – Tire Depth | 0.75 |
| Deep Mud – Wheel Depth | 1.00 |
| Deep Mud – Body Depth | 1.33 |
Operational Guidance
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Confirm all anchor points exceed expected load
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Avoid sudden dynamic loading where possible
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Increase safety margin in uncertain conditions
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Do not rely on minimum ratings in severe environments
