Rigging Block Redirect Resultant Load
Resultant force on a rigging block and its anchor when a line changes direction (up to twice the line tension when doubled back). Size for the resultant, not the line tension.
Formula and source
resultant = 2 x line_tension x sin(direction_change / 2). A 180-degree turn doubles the line tension on the anchor.
ASME B30.26 and standard rigging statics by name; first-principles vector resultant.
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