Swing Fall Geometry (Pendulum Drop and Arc)
Working off to the side of an anchor turns a fall into a pendulum, and the vertical clearance calculation never counted it. Offset 10 ft with the anchor 20 ft up is exactly 30 degrees off vertical: the worker drops an extra 2.68 ft just getting under the anchor and arrives at the bottom of the arc doing 13.1 ft/s SIDEWAYS. Adds the swing drop to whatever fall-protection-clearance required, and flags the 30-degree guidance. Pure geometry - the strike, lanyard stretch, and SRL locking are not modeled.
Formula and source
swing angle = asin(X/L); swing drop = L - sqrt(L^2 - X^2) = L(1 - cos theta); speed at the bottom of the arc = sqrt(2 g h); arc travelled = L x theta; total clearance = base + swing drop.
Pendulum geometry - no standard claimed and no new constants. The 30-degree limit for keeping an anchor overhead is commonly given fall-protection guidance, reported as such rather than as a computed threshold.
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