This is a new, reusable engine that is ready to be installed on a rocket. It is a flight-ready engine, not a prototype, but it has not yet been certified and received the necessary permits from the regulatory authority. It is expected that the first launch using the new Rocket Lab engine will take place next year. Archimedes, powered by methane and oxygen steam, was tested at NASA's John C. Stennis Space Center in Mississippi. The engine produced 102 percent of its rated power (75 tons at sea level) during testing. This engine will be used on the reusable Neutron rocket, replacing the Electron. Seven engines are planned for the first stage and one for the second stage. An important design feature of the rocket is the fairing, which is integrated into the first stage. The fairing will open to release the upper stage after the first stage has completed its mission.