Max Wind Speed Before a Load's Swing Limit
The inverse of the wind-on-load tile: the sustained wind speed at which a suspended load reaches a maximum allowable swing, V = sqrt(weight x tan(swing) / (0.00256 x area x shape)). A 4,000-lb load with 200 ft^2 of sail reaches a 5-degree swing at ~20.7 mph; a lighter load or bigger sail hits it sooner. A planning estimate; the manufacturer's in-service wind limit and the load chart govern.
Formula and source
V = sqrt( load_weight x tan(max_swing) / (0.00256 x sail_area x shape_coef) ), the swing relation swing = atan(0.00256 V^2 x area x shape / weight) solved for the wind speed.
ASCE 7 velocity-pressure constant (the same 0.00256 the wind-pressure tile uses) and OSHA 1926 Subpart CC by name; first-principles.
Audience
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