Casualty weight
— t
On Scene Solutions • Operator tool
Winching
calculator
Estimate vehicle recovery resistance using casualty weight, ground conditions, damaged wheels and gradient.
PlanCalculateCheckControl
Important / 01
Planning aid
This calculator provides an estimated recovery resistance using the entered conditions and its configured calculation factors. It does not determine whether a winch, rope, block, connection, anchor, recovery vehicle or complete rigging system is suitable for the operation.
Use actual equipment markings, manufacturer information, applicable procedures and competent assessment when planning a real recovery.
Operator calculation
Recovery resistance
Enter the known casualty and recovery conditions to produce an estimated resistance using the calculator's configured factors.
Method / Trace
How this result was calculated
Rolling resistance
Casualty weight × configured surface factor= — t
Damage resistance
Calculated using damaged wheels / total wheels= — t
Gradient resistance
Calculated from casualty weight and slope= — t
Winching up / down
Rolling + Damage + Gradient= — tRolling + Damage − Gradient= — t
Complete recovery system
The calculation is only the start.
The required pull is only one part of the recovery system. Before power is applied, consider every component and every reaction created by the actual rigging arrangement.
Winch
→Rope
→Blocks & connections
→Anchors
→Casualty
- Drum layer
- Ratings, markings & manufacturer information
- Line direction
- Blocks, connections & line angles
- Vehicle stability
- Exclusion zone
- Attachment points
- Ground conditions
The OSS Winching Calculator is a separate resistance-estimation tool and should not be treated as a substitute for the full recovery-planning method used during training.