https://www.teslarati.com/elon-musks-spacex-ama-mars-bfr-bfs-spaceship/f9r-dev-steve-jurvetson_1/
F9R-dev (Steve Jurvetson)_1 - TESLARATI
Sep 17, 2018 - F9R-dev, used to test vertical take off and landing for Falcon 9. BFR will go through a similar program with its spaceship upper stage prior to orbital...
f9r devsteve jurvetson1