Crane Tipping Moment - SWL vs Radius
Safe working load at a given radius for a jib crane with triangular stability limit - SWL × radius = constant overturning moment.
Max overturning moment
150.0t·m
SWL at current radius
12.5t
Formula, assumptions, and limits
Hyperbolic load-radius limit is classical. Modern cranes use rated-capacity chart with additional safety regions. Include block weight, rigging, and 1.2–1.5× dynamic factor.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Safe working load | t | load chart | |
| Lift radius (jib pin to hook) | m | crane geometry |