Crane Outrigger Reaction from Lift Geometry
The maximum single-outrigger reaction over a corner from the gross load and radius, counterweight, and outrigger spread (R_max = (W+Wc)/4 + M/(sqrt(2) spread)). Not a quarter-share -- swinging over a corner can concentrate well over half the load into one outrigger. The load crane-ground-bearing asks for but never derives.
Formula and source
even = (W + Wc)/4; overturning M = W x R - Wc x Rc; R_max = even + M/(sqrt(2) x spread).
Crane load-moment method / SAE J1063 stability, by name.
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