SpaceX Starship Flight 13 Aborted Amid Raptor Engine Failures

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SpaceX's Starship launch aborted less than a second before liftoff because four Raptor engines feel to ignite.

**SPEAKER_6** (1:37)
The flight computer, it detected that insufficient thrust right at ignition. So the automatic abort triggered the exact moment the water deluge system activated. You have this massive 11 million pound machine just sitting on the pad fully fueled and it shuts itself down at the absolute last millisecond. It leaves you looking at this and wondering if they're just dealing with normal testing friction or if they have a fundamental engine problem. And that's a problem that threatens an entire space industry that has basically tied its future to this exact rocket succeeding.

**SPEAKER_5** (2:10)
And if you look at the mechanics of that T0 abort, it shows you exactly how tight the operational margins actually are. The flight computer has to manage just an impossible amount of data in those final milliseconds. For the super heavy booster, the acceptable limit is a maximum of three failed engines on startup. They have 33 Raptor engines clustered at the base, and they're all trying to light simultaneously.

**SPEAKER_6** (2:30)
To understand why three is that hard limit, you have to look at the physics of the vehicle. Like I said, the whole stack weighs roughly 11 million pounds when it's fully loaded with liquid oxygen and liquid methane. So those 33 engines combined, they produce around 16 million pounds of thrust. If you lose one or two engines, you are losing a fraction of your total thrust, sure, but your thrust to weight ratio remains above one.

**SPEAKER_5** (2:55)
So the rocket can still physically lift off the pad.

**SPEAKER_6** (2:58)
Exactly. The flight computer can technically compensate for that loss of thrust by up the remaining active engines. It pushes them to slightly above their normal rated performance.

**SPEAKER_5** (3:07)
It also has to adjust the thrust vector, right? Yeah. Because the engines on the outer ring are fixed, but the inner engines can gimbal, meaning they can tilt to steer the rocket.

**SPEAKER_6** (3:17)
Yeah, that's a huge part of it. If you lose two engines on the left side, the rocket naturally wants to tip to the left, so those gimbling engines have to immediately pivot to counteract that asymmetrical thrust and keep the vehicle flying straight up away from the tower.

**SPEAKER_5** (3:29)
But on this attempt, four failed. That crossed the hard threshold programmed into the flight computer.

**SPEAKER_6** (3:35)
Because if you lose four engines, especially if they happen to be clustered on one side, that asymmetrical thrust just becomes too extreme.

**SPEAKER_5** (3:43)
The gimbling engines just cannot pivot far enough to compensate for that.

**SPEAKER_6** (3:46)
If the hold down clamps were to release at that exact moment, the rocket tips sideways and basically destroys the entire launch infrastructure.

**SPEAKER_5** (3:55)
So that crossed threshold, it triggered an automatic halt. The computer shut down the entire ignition sequence to protect the launch pad from a potential fallback or catastrophic explosion. Elon Musk actually confirmed afterward that they'll have to physically replace at least two of those engines right there on the pad and try again.