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'Relativity Space' Aborts Second Launch Attempt of Its 3D-Printed Rocket (wired.com) 13

"Based on initial data review, vehicle is healthy," Relativity Space tweeted today. "More info to follow on cause of aborts today. Thanks for playing."

Remaining back on the launchpad is the largest 3D printed object ever to exist. And they're still hoping to launch it into space.

They'd planned a launch this morning from Cape Canaveral, Florida of a 110-foot rocket (33.5 meters) on a mission they're calling GLHF — "Good Luck, Have Fun".

The rocket's makers — California-based Relativity Space — call it "the world's first 3D printed rocket." A full 85% of the rocket's weight comes from 3D printed parts, explains Wired, and "only the computing system, electronics, and readily available parts like fasteners were not." Named Terran 1, the 7.5-foot-wide rocket (2.2 meters) inaugurates the company's ambitious plans for 3D printing in space: Relativity Space wants to use Terran 1 to (comparatively) cheaply lift satellites for other companies and NASA into Earth orbit. It also plans to construct Terran R, a larger, more powerful, fully reusable rocket that the company hopes will compete with SpaceX's Falcon 9, which has a smaller payload capacity and only reuses the rocket's first stage. In late 2024, Relativity plans to test using Terran R to launch payloads to Mars; another startup, Impulse Space, will provide the lander.
From the company's web site: Like its structure, all Relativity engines are 3D printed and use liquid oxygen and liquid natural gas, which are not only the best for rocket propulsion, but also for reusability, and the easiest to eventually transition to methane on Mars.
The tagline for the company's Twitter feed says they're "Building humanity's multiplanetary future." And excitement is running high, reports Spaceflight Now" "There are a number of firsts here potentially on this rocket," said Josh Brost, vice president of revenue operations at Relativity Space....

"Hard to believe the day is nearly here to launch Terran 1, our first rocket!" Tim Ellis, co-founder and CEO of Relativity Space tweeted Tuesday....

The company now boasts some 1,000 employees, a million-square-foot headquarters and factory in Long Beach, California, and $1.3 billion in venture capital and equity fundraising, including an early $500,000 investment from billionaire Mark Cuban. In 2021, the company reached a valuation of $4.2 billion before launching any rockets....

"No new company has ever had their liquid rocket make it to space on their first attempt," Brost, also a former engineer and manager at SpaceX, told Spaceflight Now in a pre-launch interview. "So if everything goes incredibly well, and we achieve orbit on our first launch ... that would be a remarkable milestone for us, which we would be, of course, over the moon excited about. But that doesn't define success for us."

Wired adds that they're not the only company working on space-related 3D printing: Australia's Fleet Space has already been producing lightweight, 3D-printed radio frequency antennas for satellites. Next year, using printers half the size of a bus, they plan to create a satellite constellation called Alpha that will be entirely 3D-printed.... Flavia Tata Nardini, the company's CEO, believes space-based 3D printing is coming next. "In my ideal future, in 10 to 15 years, I won't have to launch satellites from here; I can build them up there."
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'Relativity Space' Aborts Second Launch Attempt of Its 3D-Printed Rocket

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  • Honest question: Their big concern is that the 3D-printed vehicle won't survive Max-Q.

    If I understand correctly, Max-Q isn't "one specific speed" but rather the maximum pressure generated at some point in the flight where the air pressure is significant and so is the airspeed. Rockets that can "throttle down" to go through this interface between higher-pressure/lower-speed and as leaving the atmosphere result -- lower pressure so higher speed again.

    Why don't they use those upper-level winds and "go with t

    • Winds are not necessarily going in a single direction at every altitude, and because the rocket is moving so fast, the differences in direction of wind changes rapidly from the rocket's perspective.
    • I want to say the upper level winds are minimal compared to the overall air pressure and it's just a way less complex and predicatable procedure to just throttle down for max Q than try to work with the winds. Basically they know what the pressure the rocket will expereince at max Q so just design for it.

      I think that's the answer, someone smart feel free to correct me

    • Maximum dynamic pressure usually occurs at a speed above Mach 1, i.e. it's mostly caused by the rocket pushing through the atmosphere and not by wind.
      To go with the wind, you'd need the wind at altitude to be in the direction of flight, adding another launch constraint.

  • Would they slow it down?

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