Outrigger

An outrigger is a projecting structural element that extends beyond the main body of an object to provide stability or support. The term is used in nautical, architectural, and construction contexts, and the specific form and purpose vary with application.

In boats and canoes, an outrigger is a buoyant float connected to the main hull by spars. The float widens the flotation envelope, increasing stability and allowing for lighter, swifter hulls. Traditional examples include Polynesian and other Pacific Island outrigger canoes, which may use one or two floats made from wood, fiberglass, or composite materials.

In architecture and civil engineering, an outrigger refers to a structural extension that projects from the building to increase overall stiffness and resistance to lateral loads such as wind or earthquakes. Outriggers work with belt trusses or shear walls to transfer forces to the foundation, enabling taller or wider structures and larger floor plates. They are common in modern high-rise design and in retrofit projects.

In construction and industrial contexts, outriggers are extendable supports used to stabilize machinery and vehicles. On cranes, lifting platforms, and other heavy equipment, outriggers widen the base to prevent tipping during operations and are deployed hydraulically or mechanically and retracted for transport.