https://www.space.com/starship-proto...sure-test.html
SpaceX's Starship SN4 prototype passes another, tougher pressure testSpaceX's latest
Starship prototype keeps passing tests, edging closer and closer to a highly anticipated test flight.
The SN4 vehicle, the latest pathfinder for SpaceX's Starship Mars-colonization spacecraft, aced a high-pressure and high-simulated-thrust trial at the company's Boca Chica facilities in South Texas, SpaceX founder and CEO Elon Musk announced on Twitter on Saturday (May 9). And this was a "cryo" test: the SN4 was filled with frigid liquid nitrogen, simulating the conditions experienced during operational missions, which will employ ultracold propellant.
The SN4 already had a "cryo proof" success under its belt,
surviving one on April 26. The vehicle endured pressures of 4.9 bar during that earlier test, compared to 7.5 bar over the weekend, Musk said. (Atmospheric pressure at sea level is 1 bar.)
The prototype has also performed two "static fires," lighting up its single
Raptor engine briefly
on May 5 and then again on May 7, both times remaining firmly on the ground.
That's probably as high as the SN4 will get. SpaceX is already building its successor, the three-engine SN5, which Musk has said will target a test-flight altitude of 12 miles (20 kilometers)........