[iPhone God App] It was found using the Rigger Ref actually

Rigger Ref is a reference and calculation utility for riggers. Keep specifications of ropes, hardware, slings, and material densities at your finger tips. Quickly figure safe working loads, line sag, amount of line on a drum, and bridle calculations.

Calculation features:
-Figure Catenary curves based on line tension, weight, line weight, and tower heights.
-Figure amount of Line on a Drum using Drum Calc
-Estimate weights based on volume and materials using Load Calc
-Figure sling tension, and angles for different bridles
-US and Metric units / on the fly conversion

Reference Features:
-Common Rope Specifications
-Common Hardware Specifications
-Common Sling Specifications
-Search Specifications and Comments
-Automatically figure Safe Working Loads
-Quick Ruler for measuring Line widths on the home screen

Customization Features:
-Add your own Ropes or Hardware
-Set your own Safety Factors for figuring Safe Working Loads
-Track which ropes and hardware you've got on hand.
-Create manifests of frequently used equipment to automatically total weights or costs.
-Track when a manifest or equipment exceeds or falls short of a weight budget.
-Mail manifests of equipment or labor quickly.
-Easily import manifests onto other devices running Rigger Ref.

Ontomni Features:
-Extensive Context Sensitive Help
-Prompt Support