Capacity falls with radius
Mobile crane charts list capacity at discrete radii. For a quick estimate between two known points, linear interpolation is a common field shortcut:
Capacity ≈ C₁ + (C₂ − C₁) × (R − R₁) ÷ (R₂ − R₁)
Crane Load vs Radius Calculator
Crane · interpolate load chart
Linearly interpolate capacity between two known radius/capacity chart points. Not a substitute for the manufacturer chart.
Formula: Capacity ≈ linear interpolate between chart radii
Frequently asked questions
Replace the load chart?
Never. Use the manufacturer chart for the exact configuration, boom, and outriggers.
Parts of line / reeving?
Chart capacity already assumes a configuration — match yours.
Dynamic factors?
Wind, duty cycle, and shock loading need separate reductions.
Gross vs net?
Subtract hook block and rigging from chart gross where required.
