Rigging hardware like this unique three-ring purchase for use on sailcraft is cast in aluminum bronze. This
purchase was produced via a digital sand printed mold by Port Townsend Foundry (Port Townsend, Washington). Copper alloys have a high resistance to biofouling and corrosion so they are often a material of choice in seawater applications.
The engines that propel most boats also feature castings, such as this exhaust manifold for a V8 engine used in both freshwater and salt water boats. The one-piece aluminum design combined the water jacket and exhaust into a single part, cast by Stahl Specialty Co. (Kingsville, Missouri).
The lost foam casting process produced this exhaust housing for the marine engine industry. The single part integrates the exhaust, cooling, steering and mount housing for an outboard engine—replacing a 28-component assembly. The success of this housing, cast by BRP-US Inc. (Spruce Pine, North Carolina), prompted similar consolidations on other marine engine applications.
Other cast boat items include handles, stanchions, cleats, steps, and shackles, like the one shown. Some boats are also adorned with cast decorative pieces attached to knobs, pulls, hooks, and treads.
This thermal command center combines water pump, thermostat and bypass valves for a marine powertrain system. Supplier Tooling & Equipment International (Livonia, Michigan) used additive manufacturing in the prototype stages for this new casting design.
January 2017 MODERN CASTING | 39
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