 Some multihulls with four (quadrimaran) or five (pentamaran) hulls have been proposed; few have been built.A Swiss entrepreneur is attempting to raise €25 million to build a sail-driven quadrimaran that would use solar power to scoop plastic from the ocean; the project is scheduled for launch in 2020.A French manufacturer, Tera-4, produces motor quadrimarans which use aerodynamic lift between the four hulls to promote planing and reduce power consumption.