SSTO is Coming

Single stage to orbit. It's going to be a new age for orbital access.

ARCA's revolutionary aerospike engine completed and ready for testing ARCA Space Corporation has announced its linear aerospike engine is ready to start ground tests. ​Designed to power the world's first operational Single-Stage-To-Orbit (SSTO) satellite launcher, the engine took only 60 days to complete from when fabrication began.​ newatlas.com