SpaceX Starts Testing its Super Heavy Booster, and It’s “Not Good”
upstart writes:
"Going forward, we won't do a spin start test with all 33 engines at once":
A ground-based test of the Super Heavy rocket that is intended to boost a Starship upper stage into orbit ended in flames on Monday afternoon at SpaceX's launch site in South Texas. A fire burned in the vicinity of the pad, on and off, for more than an hour.
This is the first time SpaceX has tested a booster stage-this one bears the designation Booster 7-equipped with a full complement of 33 Raptor rocket engines. Monday's test was not intended to lead to a static fire test, during which the engines are briefly ignited, so seeing fire erupt from the aft end of the vehicle at 4:20 pm CT local time was a surprise.
The methane-fueled Raptor engine has a complicated sequence of events that must unfold precisely in order for it to ignite, and SpaceX was testing the "spin start" portion of this ignition sequence when the anomaly occurred. Something must have caused methane propellant to ignite, with the ambient oxygen in the air serving as an oxidizer, inside the vehicle.
[...] Internally, SpaceX had been targeting a potential orbital launch attempt for the Super Heavy rocket and Starship upper stage in August, which would boost the upper stage to an altitude of about 250 km before the vehicle returned to Earth. The company has yet to get a formal launch license from the Federal Aviation Administration for this test.
[...] If Booster 7 cannot be salvaged, it would not be the end of the world. SpaceX has established an assembly line in South Texas where boosters and Starship vehicles can be built in a matter of months. Several are presently in various stages of work. The potential loss of 33 Raptor engines, however, would be more significant.
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