SpaceX

SpaceX’s Starship prototype moved to launch pad on new rocket transporter

SpaceX moved its massive Starship prototype from build site to launch pad on March 8th, paving the way for the imminent beginning of static fires and tethered hop tests. (NASASpaceflight - bocachicagal)

Over the last two or so weeks, SpaceX engineers and technicians have continued to make progress on the company’s first full-scale Starship prototype, intended to support experimental suborbital hop tests as early as March or April.

That work reached a peak on March 8th when the massive Starhopper was transported from build site to launch pad on a brand new transporter that was delivered and assembled barely 48 hours prior. Ahead of the suborbital prototype’s move, work has been ongoing to construct a replacement fairing for the partial-fidelity vehicle, although there is a chance that the new BFR-related stainless steel sections being assembled could be the start of the first orbital Starship prototype.

Required after improper planning destroyed Starship’s original nosecone (or fairing) when it broke free from its insufficient moorings during high coastal winds, the replacement has sprouted from sheets of metal into a far more substantial structure in barely two weeks. Designed as two integral parts of a suborbital Starship prototype, the upper section (i.e. fairing, nosecone, etc.) is predominately a passive aerodynamic structure with no major active functions, thankfully meaning that the first article’s accidental destruction was a relatively minor loss.

In fact, it’s entirely possible that the fairing’s demise has had a minimal impact on the commencement of hop tests, and may have even been a net-good for the program given some visible differences between Starship fairings #1 and #2. Despite the fact that the first fairing was destroyed in late January and a comment from CEO Elon Musk indicating that it would trigger a delay of a few weeks, SpaceX did not begin to assemble its replacement until February 21st, a full month later. Over the course of those 30 or so days, the company’s propulsion team simultaneously began hot-fire tests of the first full-scale Raptor engine, ramped thrust and chamber pressure from roughly 40 to 100 percent, and ultimately pushed the engine to the point of damage around the second week of February.

Work on the primary structure of the Starship prototype also proceeded apace, fleshing out the brute-force steel vehicle with the beginnings of serious avionics and plumbing and more or less completing the structure of its liquid oxygen and methane propellant tanks. SpaceX workers also rapidly expanded and built-out Starship’s prospective hop test launch pad just a few thousand feet distant, installing tank farms, piping, water deluge hardware, and building an actual concrete ‘pad’ with umbilical connection ports and attachment points for the ship’s three fin-legs.

On March 7th, Starhopper’s replacement fairing was lifted onto a concrete work stand, where curved sections will begin to be attached. (NASASpaceflight – bocachicagal)

Welding and assembly of the replacement nosecone began around February 21st, rapidly growing from a few sheets of steel to a nearly-complete barrel section measuring about 9m tall and 9m in diameter (30ft x 30ft). Intriguingly, the new fairing appears to be a significant departure from the structural composition of its predecessor, utilizing far thicker sheets of stainless steel joined by uninterrupted width and lengthwise welds. Compared to the first fairing’s dependence on extremely thin (nearly foil-like) steel sheets and a separate internal framework of metal bars, Starship fairing V2 appears to be easily capable of standing under its own weight and then some. While largely passive, it’s likely that once the structure is complete, some level of additional avionics (and perhaps cold or hot-gas maneuvering thrusters) will be installed inside.

U-Crawl

Keeping in the practice of dramatically lowering costs by prioritizing consumer off-the-shelf (COTS) hardware solutions wherever possible, SpaceX has purchased or leased a quartet of (likely used) crawlers for the purpose of transporting Starship between the company’s South Texas build, launch, and landing sites. Built by a European conglomerate known TII Group and owned by US-based Roll Group, SpaceX’s four crawlers – coupled to form a duo of larger crawlers – should be more than capable of transporting anywhere from 500t to 1000t or more, easily supporting Starhopper and/or Starships and Super Heavy boosters.

SpaceX accepted delivery of a quarter of crawlers on March 6th and immediately coupled them and began installing massive steel beams to form a Starship transporter. (NASASpaceflight – bocachicagal)

Rather than spending huge amounts of money to develop or contract out a custom-designed crawler or transporter solution for BFR, SpaceX appears to have simply purchased off-the-shelf hardware and affixed them with heavy steel structures capable of securing and supporting Starhopper during transport. Within 24 hours of the crawler arrivals, those beams were installed and the transporter had been moved underneath Starhopper and attached to it before quite literally jacking the massive ship off the ground, allowing technicians to weld additional structures to the tips of its three legs.

The latest addition to SpaceX’s fleet of rocket transporters, March 6th. (NASASpaceflight – bocachicagal)

Last but not least…

Perhaps most curious of all, Starhopper’s replacement fairing was recently joined by the start of work on a separate barrel section that appears to be nearly identical. Assuming the presumed fairing is, in fact, a fairing-to-be, the combined height of the two barrel sections would already make it significantly taller than the original nosecone, and the beginning of the conical taper has yet to appear on either assembly. This could generally mean one of two things. First, the new fairing could make Starhopper much taller than its short-lived predecessor. Second, SpaceX could be planning to begin (or even complete) hop tests without a fairing, in which case the presumed fairing and its slightly younger twin could actually be the beginning of a higher-fidelity Starhopper or even the orbital Starship prototype hinted at by Musk earlier this year.

While far less likely than the first option, the latter alternative is further supported by the fact that visible work has begun on some sort of tapered or curved steel complements to the new sections in work. While they certainly could be the beginning of the fairing’s tapered cone, the latest segments only loosely resemble the start of a gradual curve. Instead, they look similar to the steel segments of several giant tank domes that were assembled, welded, and installed inside Starhopper last month.

One of the latest curved sections of welded steel, March 7th. (NASASpaceflight – bocachicagal
Meanwhile, giant 9m-diameter tank domes are being assembled and welded together a few hundred feet away from Starhopper. (NSF – bocachicagal)

On March 8th, SpaceX began the transport of its first full-scale Starship prototype at the same time as CEO Elon Musk indicated that the first flightworthy Raptor(s) would be delivered to South Texas and installed on the hop test article as early as next week (March 11-17). It’s now looking increasingly likely that any replacement fairing that may or may not be under construction might not be ready for installation on Starhopper before SpaceX begins integrated static-fire tests and maybe even low-altitude tethered hop tests.

“SpaceX will conduct checkouts of the newly installed ground systems and perform a short static fire test in the days ahead,” he said. “Although the prototype is designed to perform sub-orbital flights, or hops, powered by the SpaceX Raptor engine, the vehicle will be tethered during initial testing and hops will not be visible from offsite. SpaceX will establish a safety zone perimeter in coordination with local enforcement and signage will be in place to alert the community prior to the testing.” – James Gleeson, March 8th, SpaceX

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SpaceX’s Starship prototype moved to launch pad on new rocket transporter
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