RS1 — USA, 2023

ABL Space Systems, in its earlier days, was working on a rocket quite similar to the Firefly Alpha, with two — no, three — no, nine — kerosene engines on the booster, and a tiny one on the upper stage. It aimed to carry 0.6 — no, 1.2 tons, which is on the high side for a smallsat launcher, but if someone has a sat that size, it gives them a spot in the market with little competition from the existing smallsat companies. They raised that goal to 1.35 tons once their “E2” engine performed better than planned. They quoted a flat price per launch of $12 million, which is not that low compared to some of the other outfits. Rocket Labs sells Electron launches for significantly less, and Astra was promising they would dramatically undercut the Electron’s price. And heck, there was a Russian/Spanish company called SpaceDarts which, if they could be believed, might someday be able to put something tiny in orbit for under $50,000 if you buy in bulk. Of course, they all targeted lower capacity.

(At the time, I thought the real threat they should probably have worried about was the list of companies working toward a rocket that is both small and reusable. Several European and Asian groups are pushing in that direction.)

Like many other smallsat companies, they were trying to leverage 3D printing to make an expendable rocket engine cheaply. But they used it only for selected components, such as the combustion chamber; for a lot of parts, they stuck to copying designs already known to work dependably. Their whole philosophy is that innovation means nothing unless you know it will work, so proven reliability trumps all other goals. The rocket body was traditional aluminum — no carbon fiber here.

They thought they could develop a new rocket faster than other companies, but we’ve heard that before... in the end, they had to repeatedly revise their plans. At first they were contracting to buy staged-combustion engines from another company, then they switched to making in-house gas generator engine, then they changed the tank diameter, then they gave up on their first stage engine and just dotted the bottom of the booster with nine second stage engines, as that was the only one they’d got working.

Like several other American builders of small rockets, they were trying to fulfill the Pentagon’s desire for a launcher which can be deployed very quickly. They planned to launch it from a heavy truck, like a Chinese ICBM — no wait, now they’re using a portable mount that can be delivered in a shipping container and set down on a paved surface. They use the unfortunate old-timer term “launch stool” for this portable support structure. All the fuel tanks and pumps and controls were also containerized.

Their long term plan was to so thoroughly automate the launch process that no live human being needed to be present at the site; someone can just push a button remotely and up it goes. They got some  Air Force  Space Force money to pursue that goal. The Pentagon wants this to be doable from “austere” locations — like maybe they had visions of camoflaged trucks keeping launch sites hidden, though I can’t imagine what the benefit of that would be.

One aspect of this cost-cutting portable approach is that they wanted to be able to use cheap jet fuel when properly refined rocket-grade kerosene isn’t available. This could have gotten them in trouble, as jet fuel can have contaminants that react with metals in the engine, or long-chain impurities that congeal into gunk in small passages. Issues like these are why a lot of companies are looking to cleaner fuels like methane and propane, despite their lower density and higher risk of explosions. But South Korea’s Nuri is a rocket that got away with using jet fuel.

ABL's founders are former SpaceX engineers, notably Harry O’Hanley and Dan Piedmont, who are now CEO and CFO. The whole company is full of industry insiders and veterans. And in 2021 they somehow sold Lockheed on a deal in which the larger company would hire them for dozens of launches. Nice work if you can get it, and quite a vote of confidence in a rocket that was far from ready at the time. They raised substantial capital without going at all public, and with Lockheed behind them they should nood ever need to worry about having enough money.

But they never showed us any reason to be more confident in them than in any of their main competitors. For a long time their maiden launch was perpetually just a few months away, and when they finally got it down to weeks, their second stage had a “hard start” and blew up on the test stand. They finally got a complete rocket to a launchpad in Alaska, only to repeatedly scrub the launch — twice doing so just after engine ignition. Then, months late, when they finally got their rocket to lift itself off the pad, it decided it didn’t feel like it, and shut off all nine engines in midair, while still directly above their ground equipment. This substantially increased the company’s supply of burnt wreckage. They concluded that a fire took out all the wiring.

They prepared a second rocket, and it leaked fuel and caught fire during a static test. This was followed by employee layoffs. So far, their philosophy of proven reliability above all has not borne any fruit.

Then in late 2024 — a time when the “Failed Plans” section of this site was undergoing record growth — they called it: they are abandoning the RS1, and all plans to compete in the commercial satellite launch business. Thanks to successful companies like SpaceX and Rocket Lab, they see shrinking opportunity to compete in these markets, as there is little demand the leaders are failing to supply. But thanks to murderous assholes like Vladimir Putin and Kim Jong Un and Ayatolla Ali Khamenei, there is a rapidly expanding market elsewhere: missile defense. The company is pivoting to focus entirely toward building anti-missile technology, which is definitely an area where supply is now well short of demand. Good luck with that, I guess.

RS1: mass unknown, diam 1.8 m, thrust 560 kN, imp unknown, gas generator (kerosene), payload 1.35 t, cost hopefully $9M/t, record 0/0/1 (final).