Last night Elon Musk posted a pair of low resolution images showing the new Raptor engine getting ready for testing at the Mcgregor, Texas facility. Raptor is a next generation design using full flow staged combustion cycle, a design which has never been successfully flown, but offers superior performance and reusability.
SpaceX's Full Size Raptor Rocket Engine Revealed By Elon Musk | Scott Manley | Published on Feb 1, 2019
The Raptor has achieved enough thrust to be operational. The burned copper doesn’t seem to be a concern: