Elon Musk posted two words on July 31 — 'Hot staging' — alongside a video that's racked up over 330,000 views. It's a reference to one of the most consequential engineering decisions SpaceX has made with Starship, and it's been working. Here's everything you need to know about what hot staging is and why it matters for the program.
What exactly is hot staging?
Hot staging is the technique of igniting Starship's upper stage engines while it is still physically attached to — and in the process of separating from — the Super Heavy booster. Rather than waiting for a clean separation before the upper stage fires, both stages are briefly burning simultaneously. The name comes from the heat generated by the ship's engines blasting back toward the booster during that overlap window.
Why does SpaceX do it this way instead of a clean separation?
The physics are compelling. A conventional 'cold' staging approach means the upper stage coasts for a moment before igniting, losing velocity to gravity and drag during that gap. Hot staging eliminates that loss almost entirely. According to SpaceX, the technique can increase Starship's payload-to-orbit capacity by roughly 10% — a significant margin when you're trying to move tens of tonnes to low Earth orbit or beyond. It also helps settle liquid propellants in the tanks and reduces the risk of a failed ignition at staging altitude.
When did SpaceX first use it on Starship?
Hot staging debuted on Starship Flight Test 2. It has since been refined across subsequent flights, with a successful execution on Flight Test 5 in October 2024 — notably right before the Super Heavy booster's historic catch at the launch tower. The most recent confirmed successful hot-staging maneuver came during Flight 13 on July 24, 2026, where the Super Heavy booster's 33 Raptor 3 engines fired and Starship's six upper-stage Raptor engines ignited to carry the vehicle toward orbit.
What's the hardware that makes it possible?
SpaceX built a dedicated hot staging ring that sits between the Super Heavy booster and the Starship upper stage. It does two jobs: it provides the structural interface for separation, and it acts as a heat shield to protect the booster from the intense exhaust plume generated by the ship's engines firing directly above it. Without that ring, the booster would take severe heat damage at the moment of staging.
What changed for Flight 13 specifically?
According to reporting on the Flight 13 test, SpaceX modified the booster's engine startup sequence to make it more robust against timing variability during ignition. The goal was to ensure the vehicle achieved the correct directional orientation — the 'flip' — for optimal performance during and after staging. Musk also noted that Flight 13 intentionally ran at much higher acceleration than prior flights to stress-test heat shield tile attachment under high dynamic pressure. The hot staging maneuver and the broader test were reported as successful.
What does this mean for where Starship is headed?
Consistent, repeatable hot staging is a prerequisite for Starship's most ambitious missions — lunar cargo delivery for NASA's Artemis program, point-to-point Earth transport, and eventually crewed Mars flights. Each successful execution builds the reliability data SpaceX needs to certify the system for those missions. The fact that Musk is sharing footage publicly suggests the team is confident enough in the technique to put it front and center as a program milestone rather than a test objective still under scrutiny. For more on SpaceX's progress, see our SpaceX coverage.
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Sources & reporting notes
The links below identify the material source records used for this report.
- @elonmusk on X (2026-07-31T05:53:51.000Z) — Direct source
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