Pressure Hull STS Sub Design Software (Windows 64 bit only) First, download and install this Runtime Engine Next, download, extract and run STS SubDesigner v092b Stiffened Cylinder Hull Design Calculator   (MS Excel) Unstiffened Cylinder Calculator

Tank Heads 2:1 Ellipsoid Tank Head Weight, Buoyancy, and Pressure Chart   (MS Excel) Tank Head Volume Calculator   (Web Interface)

Hull Opening Reinforcement 100% Rule Reinforcement Calculator   (Web Interface) ABS Rules Reinforcement Calculator   (Web Interface)

O-Ring Design Apple Rubber O-Ring Calculator   (Web Interface) Parker O-Ring Calculator   (Web Interface) CTG O-Ring Calculator   (Web Interface)

Viewports 1-ATM Flat Disc Design   (Web Interface)

Trolling Motors Horse Power Calculator   (Web Interface) Running Time Calculator   (Web Interface)

Miscellaneous 1ATM Weights, Buoyancy and Cost spreadsheet   (MS Excel) Cabin Flooding Calculator   (MS Excel) Cabin Flooding Calculator   (xlsx) Pressure/Depth Converter   (Web Interface)