Center of Gravity and Pick-Point Load Share
Load on each of two pick points and the percent imbalance from the total weight, span, and CG offset.
Example
You enter
- Total load weight (lb) 12000
- Span between pick points (in) 120
- Distance from pick 1 to CG (in) 40
You get
- Load on pick 1 8000 lb
- Load on pick 2 4000 lb
- Imbalance 33.3%
Checked against published worked examples from: ASME B30.9 / ITI rigging practice.
Details, formula, and sources
ScopeWith a flag when the CG falls outside the picks. The head rigger and the load weight govern.
Formula or tableload_p1 = W x (span - d1) / span; load_p2 = W x d1 / span; imbalance_pct = |load_p1 - load_p2| / W x 100; cg_outside flags d1 < 0 or d1 > span.
Source and editionASME B30.9 (Slings) and ITI rigging practice by name; first-principles statics (moment balance about a pick point).
Free accessASME B30.9 is a published consensus standard. The moment-balance statics are public.
What governsEstimate. Head rigger and manufacturer working-load-limit charts govern. Inspect every piece of hardware before the show.
API field namestotal_weight_lb, span_in, cg_from_p1_in, load_p1, load_p2, imbalance_pct
- Statics rigid load, two pick points, moment balancefirst-principles