Falcon Heavy has passed another critical milestone on the way to its maiden flight. SpaceX CEO Elon Musk took to Twitter this afternoon that Falcon Heavy the static fire “was good” and that it generated “quite a thunderhead of steam” in the process.

Falcon Heavy hold-down firing this morning was good. Generated quite a thunderhead of steam.

Source: Hot Hardware – SpaceX Completes Historic Falcon Heavy Static Fire Test, First Flight Set For Early February