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SpaceX Starship prototype days away from first Raptor static fire test

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SpaceX’s latest Starship appears to be just a few days away from becoming the first full-scale prototype to attempt a static fire test with a functional Raptor engine, potentially setting the rocket up for a hop test in the near future.

On April 26th, SpaceX teams successfully filled the fourth full-scale Starship prototype with ~1000 metric tons (~2.2 million lb) of liquid nitrogen, pressurized it to roughly 5 bar (70 psi), and exerted hundreds of tons of force on its “thrust puck” engine section with hydraulic rams. Every part of the test appears to have been completed without issue, making Starship SN4 the first to pass cryogenic proof testing and graduate to riskier tests.

Since then, SpaceX technicians and engineers have been carefully inspecting Starship and likely cleaning its cavernous propellant tanks, while also preparing a lone Raptor engine for installation. By all appearances, that engine installation milestone could occur anytime within the next 24 hours and based on public road closure schedules, the first static fire attempt could occur just a day (or less) later.

SpaceX’s latest Starship prototype could be just a few days away from its first Raptor static fire test. (LabPadre)

Capable of producing at least 200 metric tons (~450,000 lbf) of thrust, SpaceX CEO Elon Musk recently revealed that Starship SN4 will only have one Raptor engine installed. Instead, the first multi-engine static fire and flight tests are planned for its successor, Starship SN5, with SN4 apparently set to feature an asymmetric engine layout.

Starship SN4’s thrust structure and engine section are pictured here on April 12th, confirming that it’s nominally designed to host three engines. (NASASpaceflight – bocachicagal)

Designed for three engines in a triangle formation, Starship’s existing engine section and thrust structure (thrust puck) would need an inefficient one-off redesign or heavy modifications to allow a single Raptor engine to be installed directly in the center of the rocket. Unsurprisingly, SpaceX chose not to waste resources on a one-off addition to a serial prototype. Instead, if Starship survives static fire testing and the asymmetric stress that will create, the rocket may apparently attempt to launch and land with the same setup.

This would very likely result in Starship SN4 both lifting off and landing at an angle, effectively drifting its way off the launch mount and onto an adjacent landing pad.

Raptor performs a static fire test in McGregor, Texas. (SpaceX)
Starship SN4 could soon attempt to replicate Starhopper’s spectacular 150m hop. (SpaceX)

Before that potentially bizarre flight test and the static fire that must precede it, however, SN4 must also complete the first full-scale Starship wet dress rehearsal (WDR), referring to the process of fully fueling a rocket and performing a launch countdown without actually launching. It’s likely that SpaceX plans to roll Starship SN4’s WDR directly into a static fire test, meaning that the massive rocket could ignite a Raptor engine as early as Friday, May 1st.

Stay tuned for visual confirmation of Raptor engine installation on Starship SN4!

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Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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SpaceX Starship Flight 10: What to expect

SpaceX implemented hardware and operational changes aimed at improving Starship’s reliability.

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Credit: SpaceX

SpaceX is preparing to launch the tenth test flight of its Starship vehicle as early as Sunday, August 24, with the launch window opening at 6:30 p.m. CT. 

The mission follows investigations into anomalies from earlier flights, including the loss of Starship on its ninth test and a Ship 36 static fire issue. SpaceX has since implemented hardware and operational changes aimed at improving Starship’s reliability.

Booster landing burns and flight experiments

The upcoming Starship Flight 10 will expand Super Heavy’s flight envelope with multiple landing burn trials. Following stage separation, the booster will attempt a controlled flip and boostback burn before heading to an offshore splashdown in the Gulf of America. One of the three center engines typically used for landing will be intentionally disabled, allowing engineers to evaluate whether a backup engine can complete the maneuver, according to a post from SpaceX.

The booster will also transition to a two-engine configuration for the final phase, hovering briefly above the water before shutdown and drop. These experiments are designed to simulate off-nominal scenarios and generate real-world data on performance under varying conditions, while maximizing propellant use during ascent to enable heavier payloads.

Starship upper stage reentry tests

The Starship upper stage will attempt multiple in-space objectives, including deployment of eight Starlink simulators and a planned Raptor engine relight. SpaceX will also continue testing reentry systems with several modifications. A section of thermal protection tiles has been removed to expose vulnerable areas, while new metallic tile designs, including one with active cooling, will be trialed.

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Catch fittings have been installed to evaluate their thermal and structural performance, and adjustments to the tile line will address hot spots observed on Flight 6. The reentry profile is expected to push the structural limits of Starship’s rear flaps at maximum entry pressure.

SpaceX says lessons from these tests are critical to refining the next-generation Starship and Super Heavy vehicles. With Starfactory production ramping in Texas and new launch infrastructure under development in Florida, the company is pushing to hit its goal of achieving a fully reusable orbital launch system.

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Elon Musk takes aim at Bill Gates’ Microsoft with new AI venture “Macrohard”

It is quite an appropriate name for a company that’s designed to rival Microsoft.

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Credit: xAI/X

Elon Musk has set his sights on Microsoft with a new company called “Macrohard,” a software venture tied to his AI startup, xAI. 

Musk described the project as a “purely AI software company” that’s designed to generate hundreds of specialized coding and generative AI agents that could one day simulate products from companies like Microsoft entirely through artificial intelligence.

Macrohard‘s Purpose

Musk announced Macrohard on Friday, though xAI had already registered the trademark with the US Patent Office a few weeks ago, as noted in a PC Mag report. Interestingly enough, this is not the first time that Musk has mentioned such an initiative.

Just last month, he stated that xAI was “creating a multi-agent AI software company, where Grok spawns hundreds of specialized coding and image/video generation/understanding agents all working together and then emulates humans interacting with the software in virtual machines until the result is excellent.”

At the time, Musk stated that “This is a macro challenge and a hard problem with stiff competition,” hinting at the venture’s “Macrohard” moniker. A few years ago, Musk also posted “Macrohard >> Microsoft” on X. 

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Powered by xAI and Colossus

Macrohard appears to be closely linked to xAI’s Colossus 2 supercomputer project in Memphis. Musk has confirmed plans to acquire millions of Nvidia GPUs, joining rivals such as OpenAI and Meta in a high-stakes race for AI computing power. Colossus is already one of the most powerful supercomputer clusters in the world, and it is still being expanded.

xAI is only a couple of years old, having been founded in March 2023. During its Engineering Open House event in San Francisco, Elon Musk highlighted that the company’s speed will be its primary competitive edge. “No SR-71 Blackbird was ever shot down and it only had one strategy: to accelerate,” Musk said.

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Elon Musk confirms he’s still in wartime CEO mode

He is still locked in.

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Wcamp9, CC BY 4.0 , via Wikimedia Commons

Elon Musk tends to use social media platform X as his personal platform to express himself, so much so that critics tend to allege that the CEO is no longer serious about his numerous companies. 

As per Musk, he is still very much in wartime CEO mode, despite all the jokes and fun posts about Ani on X. 

Elon Musk leads several prolific companies, much more than the average CEO. And while Tesla is the only publicly traded entity that he currently leads, Musk is so visible that everyone across the internet pretty much has a strong opinion of him one way or another. For his longtime supporters and followers, however, what truly matters is if Musk is locked in.

Considering that Elon Musk’s feed on X has recently been filled with AI imagery, a good portion of which involve AI-rendered women, some X users have expressed concerns that the CEO may be losing focus once more. Musk responded to one such user by highlighting his very busy schedule and his numerous active projects. 

Needless to say, Elon Musk is still locked in. He is still in “wartime CEO” mode.

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As per the CEO, even his recent AI posts about AI are “part of a broader vision and strategy.” He also highlighted that SpaceX’s Starship Flight 10 is launching in a few days, xAI’s Grok 5 is starting its training next month, and Tesla’s Autopilot V14 is also coming next month. As per Musk, “long-term strategy is compelling.”

Elon Musk’s comments are quite accurate. While he may seem to spend all his time on X, after all, he is very much still neck-deep in all his companies’ projects. There is a reason why Musk became known as a visionary, and a lot of it is because he really is intimately involved in all of his companies’ projects. 

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