Main features include full first stage reusability with return to launch site and vertical landing, payload fairing returned with first stage for immediate re-use, carbon fibre construction, fixed fins/landing legs, liquid oxygen and methane propellants, and seven conservatively designed gas-generator cycle engines (~320 seconds Isp) on the first stage.
Turn around between flights consists simply of installing a new disposable second stage and payload, loading propellants, and launching. They expect to begin engine testing in 2022.
