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SpaceX sends “radically redesigned” Starship engine to Texas for hot-fire tests

As of September 2017, subscale Raptor engines had been cumulatively fired for more than 1200 seconds in just 12 months of testing. (SpaceX)

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6 years ago

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SpaceX has shipped one of the first of a group of Starship engines known as Raptor, described last month by CEO Elon Musk as “radically redesigned”. A culmination of more than 24 months of prototype testing, the first flight-worthy Raptor could be ignited for the first time as early as February.

According to Musk, three of these redesigned Raptors will power the first full-scale BFR prototype, a Starship (upper stage) test article meant to conduct relatively low-altitude, low-velocity hop tests over the southern tip of Texas. Those tests could also begin next month, although a debut sometime in March or April is increasingly likely.

Effectively designed on a blank slate, Raptor began full-scale component-level tests in 2014 at NASA’s Mississippi-based Stennis Space Center, evolving from main injector development to oxygen preburner hot-fires in 2015. Soon after Raptor’s prototype preburner design was validated at Stennis, SpaceX moved testing to its privately-owned and operated facilities in McGregor, Texas, where Raptor static fire testing has remained since.

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Just days before CEO Elon Musk was scheduled to reveal SpaceX’s next-generation rocket (BFR, formerly known as the Interplanetary Transport System or ITS) in September 2016, he announced in a tweet that propulsion engineers and technicians had successful hot-fired an integrated Raptor prototype – albeit subscale – for the first time ever. Just 12 months later, Musk once again took to the stage to announce an update to BFR’s design, while also revealing that prototype Raptor engines had already completed more than 1200 seconds (20 minutes) of cumulative hot-fire tests, an extremely aggressive and encouraging rate of progress for such a new engine.

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Although Raptor undoubtedly borrows heavily from much of the same expertise that designed Merlin 1 and operated and improved it for years, that is roughly where the similarities between Raptor and M1D end. M1D, powered by refined kerosene (RP-1) and liquid oxygen, uses a combustion cycle (gas-generator) that is relatively simple and reliable at the cost of engine efficiency, although SpaceX propulsion expertise still managed to give M1D the highest thrust-to-weight ratio of any liquid rocket engine ever flown. Still, measured by ISP (instantaneous specific impulse), M1D’s inefficient kerolox gas-generator cycle ultimately means that the engine simply can’t compete with the performance of engines with more efficient propellants and combustion cycles.

While SpaceX’s Falcon 9 and Heavy rockets – powered by Merlin 1D and Merlin Vacuum – are more than adequate in and around Earth orbit, a far more efficient engine was needed for the company to enable the sort of interplanetary colonization Musk had in mind when he created SpaceX. Raptor was the answer. Ultimately settling on liquid methane and oxygen (methalox) as the propellant and a full-flow staged-combustion (FFSC) cycle, Raptor was designed to be extraordinarily reliable and efficient in order to safely power a spacecraft (BFS/Starship) meant to ferry dozens or hundreds of people to and from Mars.

An excellent NASASpaceflight article explores the engine’s journey from a blank sheet to integrated static-fire tests and offers a deeper explanation of the technical details.

Raptor enters a new era

For all the extensive and invaluable testing SpaceX has done with a series of prototype Raptor engines, the engines tested were subscale versions with around 30% the thrust of the c. 2016 Raptor and around 40-50% of the updated c. 2017 iteration, producing almost the same amount of thrust as Merlin 1D (914 kN to Raptor’s ~1000 kN). In September 2018, Musk described Raptor as an “approximately…200-ton (~2000 kN) thrust engine” that would eventually operate with a chamber pressure as high as 300 bar (an extraordinary ~4400 psi), requiring at least one of the FFSC engine’s two preburners (used to power separate turbopumps) to operate at a truly terrifying ~810 bar (nearly 12,000 psi).

Conveniently stood beside a Merlin 1D engine also ready for hot-fire acceptance testing, the Raptor engine spotted departing SpaceX’s Hawthorne, CA factory last week was reportedly immense in person, towering over an M1D engine. Raptor also featured a mass of spaghetti-like plumbing (complexity necessary for its advanced combustion cycle), with a significant fraction of the metallic pipes and tubes displaying mirror-like finishes. Most notable was an obvious secondary preburner/turbopump stack and the lack of any exhaust port, whereas M1D relies on a single turbopump and exhausts the gases used to power it. Raptor’s full-flow staged-combustion cycle uses separate oxygen and methane preburners to power separate turbopumps, significantly improving mass flow rate and smoothing out combustion mixing.

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Unlike all previous hot-fired Raptors, those shipping now to McGregor, Texas are expected to be the first completed engines with a finalized design, arrived at only after a period of extensive testing and iterative improvement. They also appear to be full-scale, meaning that the test bays dedicated to Raptor will likely need to be upgraded (if they haven’t been already) to support a two- or threefold increase in maximum thrust.

SpaceX’s Starship hopper will need three finalized engines, meaning that the Raptor now in McGregor, Texas may not have been the first to arrive. Nevertheless, the shipment of full-scale hardware is always an extremely encouraging milestone for any advanced technology development program, while also foreshadowing the first imminent static-fires of the “radcally redesigned” rocket engine. With hardware now at the test site before January is out, a February test debut – one month behind a January debut teased by Elon Musk last December – is not out of the question.

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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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Investor's Corner

Tesla still poised to earn $3B in ZEV credits this year: Piper Sandler

Piper Sandler analyst Alex Potter maintained his $400 per share price target on TSLA stock.

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1 hour ago

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July 22, 2025

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Credit: Tesla

Tesla (NASDAQ:TSLA) is still poised to earn about $3 billion in zero-emission vehicle (ZEV) credits this year despite growing concerns over policy shifts under United States President Donald Trump. This is, at least, according to Piper Sandler analyst Alex Potter, who maintained his $400 per share price target and “Overweight” rating on TSLA stock.

Tesla’s ZEV credit revenue

In a recent investor note, Potter acknowledged that Trump’s efforts to undo EV-related incentives could impact Tesla’s ZEV credit income. The analyst noted that these effects would likely not be too drastic, however, even if ZEV credits provide Tesla’s finances with a substantial boost. Last year, Tesla earned about $3.5 billion from regulatory credits, equal to nearly 100% of the company’s FY24 free cash flow, as noted in a Benzinga report. 

Potter estimated that the impact of potential regulatory reversals from the Trump administration will likely not be immediate. “Tesla will still book around $3B in credits this year, followed by $2.3B in 2026,” the Piper Sandler analyst wrote.

Considering his reiterated $400 price target for Tesla stock, Potter seems to be expecting an upside of over 20% for the electric vehicle maker. It should be noted, however, that Tesla is a volatile stock by nature, so huge swings in stock price may happen even without material developments from the company.

Robotaxi developments

The Piper Sandler analyst also highlighted the progress of Tesla’s Full Self-Driving (FSD) program and Robotaxi developments as potential offsets to regulatory headwinds. Potter pointed to expanding operations in Austin and Tesla’s push to launch Robotaxi services in Phoenix and the Bay Area, pending regulatory approval. 

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“In our view, these favorable FSD-related developments are likely to overshadow any/all negative commentary arising from lower 2025/2026 estimates,” the analyst wrote.

In addition to rescinding ZEV programs, the Trump administration has proposed ending the $7,500 federal EV credit by September 2025 and rolling back Corporate Average Fuel Economy (CAFE) standards.

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Tesla sees 9,900 new vehicle registrations in China in July’s third week

Tesla introduced minor updates to the Model 3 and Model Y long-range variants recently.

Published

2 hours ago

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July 22, 2025

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Credit: Tesla Asia/X

Tesla recorded 9,900 new vehicle insurance registrations in China during the week of July 14–20, a 19.3% decline from the 12,270 units that were listed in the prior week. The drop follows a sharp surge in early July, when registrations rose 145% week-over-week.

Weekly registrations dip after early July surge

Tesla’s drop in insurance registrations last week follows a notable spike earlier this month. During the week of July 7–13, the company registered 12,300 vehicles, up 145% from just 5,010 units the week before. That surge was largely driven by strong domestic demand for the locally produced Model Y crossover and Model 3 sedan, both built at Tesla’s Gigafactory Shanghai.

Tesla introduced minor updates to both long-range models recently, as well as a minor price increase for the Model 3. The Model Y’s pricing remained unchanged, a move that likely helped maintain momentum in the highly competitive Chinese EV market, as noted n a CNEV Post report. Despite the recent dip, the Model Y continues to lead Tesla’s local deliveries, highlighting its role as the company’s top seller in China.

June sales remain strong despite lower exports

Tesla’s June wholesale figures in China totaled 71,599 vehicles, up 0.83% year-over-year and 16.1% from May, according to the China Passenger Car Association (CPCA). Retail sales in the country reached 61,484 units, making June Tesla’s second-highest domestic month of the year, behind only March. The figures suggest that the Model Y and Model 3 are seeing some stable demand in China, despite emerging competition and pricing pressure in the local EV segment.

However, exports from Gigafactory Shanghai dropped to 10,115 units in June, down 13.9% from last year and over 56% from May. The shift suggests Tesla may be prioritizing domestic deliveries ahead of new product introductions. Tesla, after all, is expected to launch the six-seat variant of the Model Y, called the Model Y L, in China in the coming months.

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Tesla Supercharger Diner officially opens: menu, prices, features, and more

Tesla’s Supercharger Diner in Los Angeles is open after seven years in the making.

Published

12 hours ago

on

July 21, 2025

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tesla diner in los angeles during daytime
Credit: Matt Hartman

Tesla has officially opened its Supercharger Diner in Los Angeles to the public for the first time. It is an 80-Supercharger lot with two movie screens and a full-service 24/7 diner that serves a wide variety of locally sourced food for patrons while they charge or even just stop by.

It is not exclusive to Tesla owners, as anyone can stop by to experience the Diner and movie theater. It officially opened to the public at 4:20 p.m. local time.

In 2018, CEO Elon Musk said he was hoping to build a full-scale 50s era diner that served as a drive-in movie theater. Seven years later, it has officially come to life, and in typical Tesla fashion, it opened at a very appropriate time of day. We heard of people waiting as many as 13 hours for the site to open.

Tesla Diner Menu

BURGERS & SANDWICHES

  • Tesla Burger: $13.5
    • 1/3 lb. prime Brandt Beef with New School American cheese, lettuce, caramelized onions, pickles and Electric Sauce on a Martin’s Potato Roll
    • Add bacon: $3
    • Add Wagyu beef chili: $3
    • Add organic free-range fried egg: $2
    • Sub veggie patty
  • Hot Dog: $13
    • All-beef Snap-o-Razzo hot dog with mustard and onion pickle relish on a Martin’s Potato Roll. Served with fried potatoes
    • Add New School cheese sauce: $1
    • Add Wagyu beef chili: $1
  • Diner Club Sandwich: $13
    • Roasted turkey, Epio Bacon, blistered cherry tomatoes, lettuce, avocado and maple black pepper mayo on toasted Tartine buttermilk bread
  • Tuna Melt: $14
    • Wild-caught albacore tuna salad with New School American cheese and pickles on grilled Tartine buttermilk bread
  • Fried Chicken & Waffles: $15
    • Classic or spicy pickle-brined organic free-range chicken between two buttermilk waffles with maple black pepper mayo
    • Add New School cheese sauce: $1
    • Add bacon: $2
    • Add organic free-range fried egg: $3
    • Sub Martin’s Potato Roll
  • Grilled Cheese: $9
    • New School American cheese on grilled Tartine buttermilk bread
    • Add blistered tomatoes: $1
    • Add Avocado: $1.50
    • Add Epic Bacon: $3

ALL-DAY BREAKFAST

  • Egg Sandwich: $12
    • Two organic free-range scrambled eggs on a Martin’s Potato Roll with Epic Bacon, New School American cheese, baby arugula and Electric Sauce
    • Add avocado: $1.50
    • Substitute waffle Avocado Toast: $11
    • Sliced avocado, lime, tomatoes, pepitas, radish and arugula on toasted Tartine buttermilk bread
  • Greek Yogurt Parfait: $9
    • Strauss Creamery organic Greek yogurt, roasted strawberries, organic gluten-free granola and local honey
  • Breakfast Tacos: $9
    • Organic free-range scrambled eggs, beef chorizo, crispy potatoes and New School American cheese sauce folded inside two Tehachapi Grain Project organic flour tortillas. Served with a side of avocado crema
    • Sub bacon: $1
    • Add avocado: $1.50 Biscuits & Red Gravy: $15
  • Buttermilk biscuit with beef chorizo gravy and an organic free-range fried egg
  • House-Baked Cinnamon Roll: $7
    • Warm, frosted cinnamon roll with flaky salt

SIDES

  • Tallow-fried French fries: $4
    • Make it a cheese fries: $1 extra
    • Make it Wagyu chili cheese fries: $3 extra
  • Hash Brown Bites: $8
    • Crispy, tallow-fried shredded potatoes served with choice of dip
  • Wagyu Beef Chili Cup: $8
    • RC Provisons Wagyu beef chili with diced white onion and New School American cheese sauce
  • Buttermilk Waffle: $5 • Dusted with powdered sugar, served with real maple syrup
  • Market Salad: $10
    • Market kale and arugula, blistered cherry tomatoes, radishes, celery, shredded carrots, avocado, salted pepitas and toasted breadcrumbs.
    • Served with Dilly Ranch
    • Add roasted turkey: $3
    • Add fried chicken: $3.50
    • Add veggie patty: $4.50
    • Add tuna salad: $5
  • Epic Bacon:
    • $12 Four strips of maple-glazed black pepper bacon served with choice of dip

KIDS MENU

  • Kids Burger: $13
    • Prime Brandt Beef with New School American cheese
  • Kids’ Grilled Cheese: $13
    • New School American cheese on grilled Tartine buttermilk bread. No crust
  • Chicken Tenders: $13
    • Made with organic free-range chicken

DESSERTS

  • Soft Serve: $6
    • Chocolate, vanilla or swirl
  • Slice of Pie à la Mode: $12
    • Warm slice of Winston’s apple or pecan pie (gf) served with Valley Ford Creamery softserve a la mode
  • Chocolate Chip Cookie: $5
    • Warm chocolate chip cookie with flaky sea salt

DRINKS

  • Cane sugar sodas: $4 each: Cola, diet cola, lemon-lime, root beer, orange, black cherry or cream.
  • Milkshakes $8
    • Vanilla, chocolate or strawberry. Make it a Pie Shake for an extra $4
    • (apple or pecan).
  • Lemonade: $4
  • Organic Draft Kombucha: $8
  • Drip Coffee: $4
  • Nitro Cold Brew: $4.5
  • Espresso (hot, iced, decaf): $4
  • Cappuccino (hot, iced, decaf): $5.5
  • Latte (hot, iced, decaf): $6
  • Iced Nitro Matcha: $6.5
  • Charged Sodas:
    • Creamsicle: $7
      • Orange soda, cream soda, vanilla foam, fresh orange and orange popping boba
    • Shirley Temple: $7
      • Lemon-lime soda, grenadine, fresh lime and maraschino cherries
    • Lime Rickey: $7
      • Lemon-lime soda and fresh lime
    • Catawba Flip: $7
      • Grape soda, vanilla foam, nutmeg and grapes
    • Dirty Kombucha: $10
      • Citrus kombucha, vanilla foam, fresh orange and lime, maraschino cherries.

Tesla Diner Details

The opening of the Diner was launched by Franz von Holzhausen, Tesla’s Chief Designer:

There is also merchandise available at the Diner, including:

  • Tesla Bot Action Figure
  • Hollywood Retro Diner Tee
  • Tesla Sweets | Supercharged Gummies: Dog Mode Chill, Mango Bolt, and CyberBerry
  • Tesla Diner Trucker Hat
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