Supersonic Passenger Flight Stalled for Fifty Years — the Blocker Was the Engine, Not Aerodynamics
Concorde was banned not because the technology failed but because its sonic boom hit the ground; Boom uses atmospheric refraction to bend the boom skyward, and the ban goes away. What actually held supersonic back for half a century was the engine — and that engine is now going to data centers to generate power first.
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The argument · tap a timestamp to hear it
Bend the sonic boom and the ban disappears
Boom's answer to the sonic boom is not to make the aircraft quiet but to use the atmosphere's own refractive capacity to redirect the boom back up into the sky. Blake calls this boomless cruise; engineers call it Mach cutoff. The boom is still produced by the aircraft, at normal strength, but it bends sharply in the air and never reaches the ground. This works below Mach 1.3 — that is, 50% faster than today. So you can't go full speed over land, but a 9 a.m. departure from New York landing in San Francisco at 9:30 still holds. Over the ocean no one is listening, so full speed is fine. Push the logic to its limit and you get the line: if there is no boom at all, there is nothing to argue about.
— Blake SchollFrom executive order to act of Congress, unanimous
The U.S. ban on overland supersonic flight, in place since 1973, ended on June 6 last year. But Blake knew an executive order could in theory be reversed by the next person, so he turned to pushing legislation through Congress. The Supersonic Legalization Act passed the House unanimously and recently cleared a Senate committee unanimously as well. He put the significance plainly: supersonic is not a partisan issue, which is the only way to get that kind of vote. For a hardware company that has to span multiple administrations on a timeline measured in decades, upgrading regulation from executive order to law turns policy risk from a variable into a constant.
— Blake SchollGetting stood up by a big company saved the company
Blake says one of the dumbest things he ever did was outsource engine development to an established large company; the plan failed, Boom split publicly with Rolls-Royce, and everyone said Boom was finished. So they decided to do what everyone said was impossible: build the engine from scratch themselves — and not just design it, but manufacture even the hardest parts, like turbine blades, in-house. His judgment: engineering and manufacturing have to be done together, and if you want to reindustrialize America you have to invent the next generation of manufacturing technology here, not bring back what was offshored to China. That forced choice later became the source of the company's valuation — because an engine designed to run at high temperature, full power, for long periods at Mach 1.7, with the fan removed from the front and a generator bolted on the back, is a power-generation device.
— Blake SchollThe supersonic engine's first customer is a data center
Boom's engine's first application is not in the sky but on the ground. Take off the fan, swap in a generator at the back, put it in a few trailers, and you can do 42 megawatts of behind-the-meter generation — and because the engine core was designed to run at high temperature, it needs no water. Blake pointed out specifically that water is a common objection, so just make it disappear. The factory has already started producing the first parts, with a target of multiple gigawatts a year and more than 10 gigawatts added to the grid over the next five years. The financial point of this path: before the supersonic airliner gets its airworthiness certificate, the company already has a product it can sell — and it is selling to the buyer with the least shortage of money right now.
— Blake SchollRun on the ground first, then fly
Boom putting the engine to work in ground power generation first has an engineering side effect: this will be the most-tested new jet engine in history, because it will have run for enormous numbers of hours on the ground before ever being installed and flown. Blake admits many hard problems remain and success is not guaranteed. The promise to passengers: twice as fast over water, 50% faster over land with no sonic boom. The sequencing itself is worth noting — normally an aviation engine's validation comes from accumulating flight hours, and Boom has moved validation onto the ground and into data-center scenarios, effectively having another market pay the test bill for the aviation business.
— Blake SchollTransatlantic round trip, breakeven fare $3,500
The numbers Blake gives: a Mach 1.7 transatlantic round trip in 3 hours, breakeven fare around $3,500, with the actual price likely higher, and every extra dollar is United's profit. His assessment of Concorde: zero out of three on safe, comfortable and cheap; Boom intends to take all three. On timeline, the target is 4 years, but he says explicitly that ‘fast matters more than predictable’, cannot give a firm date, and only commits to delivering at the earliest time physically possible — from the outside that looks like around 2030. There is a trade-off worth noting here: a hardware company publicly admitting it is unpredictable, trading certainty for speed.
— Blake SchollData-center demand is so large they plan to auction it
Asked whether the data-center business is a money printer, Blake's answer is ‘it's the most incredible money-printing business I've ever seen’, and he says his inbox holds tens of gigawatts of demand. The first engine will fire up next month, and then they intend to auction off all of the capacity. Asked whether he has talked to Elon, or whether this is for Colossus, Blake only says ‘you should ask Elon’. The value of this segment is that it gives an anomalous supply-demand signal: for a power product not yet in mass production, demand already far exceeds capacity, and the pricing mechanism has shifted from a quote to an auction.
— Blake SchollBreak the sound barrier Monday, model in the Oval Office Thursday
Blake recaps how fast this regulatory push moved: broke the sound barrier on a Monday, tweeted, Elon retweeted, flew to Washington that night to start lobbying for legalization, and by the time he landed had an invitation from the White House; into the West Wing on Tuesday, and by Thursday the aircraft model was in the Oval Office — and it is still there. From launch to signature, the executive order took 115 days, which he thinks is slow but concedes would be slower under another administration. His assessment of this administration: ‘I like that it moves fast’. This is the most concrete policy-operations sample in the whole episode: how a single technical milestone gets converted directly into political attention.
— Blake SchollIn their own words · checked verbatim
So, it's like if a tree falls in a forest, but no one was there to hear it, did it really make a sound?
Blake Scholl5:12
he agreed if there's no sonic boom there should be no ban on supersonic flight.
Blake Scholl5:12
One of the dumbest things I ever did was try to outsource our engine development to a big old company.
Blake Scholl6:12
we're not just designing our own engines, we're not just making our own engines, we're making our own engine parts down to the turbine blades.
Blake Scholl7:13
So our first application of our engine isn't in the sky. It's actually on the ground for data centers.
Blake Scholl8:13
it's more important to be fast than to be predictable.
Blake Scholl11:15
I've never seen demand like this for anything else in my life.
Blake Scholl13:15
I love how fast this administration moves.
Blake Scholl16:19
Figures
| Transatlantic round-trip time (Mach 1.7) | 3 hours | 10:38 |
| Transatlantic round-trip breakeven fare | about $3,500 | 10:38 |
| Power output of a single trailer-deployed engine | 42 megawatts | 8:13 |
| Grid capacity planned to be added over the next five years | more than 10 gigawatts | 9:14 |
| Speed ceiling for boomless cruise over land | Mach 1.3 | 12:15 |
| Time from launch to signature of the executive order | 115 days | 16:19 |
| End date of the U.S. overland supersonic ban | June 6 last year | 5:12 |
| Speed at which XB1 broke the sound barrier | Mach 1.1 | 4:10 |
| Years since Boom was founded | 12 years | 15:17 |
Glossary
- boomless cruise
- Boom's technical approach: use atmospheric refraction to direct the sonic boom skyward so it never reaches the ground.
- Mach cutoff
- The engineering name for boomless cruise — the speed range in which the boom bends in the air and cannot reach the ground.
- behind the meter
- Generation equipment built directly on the power consumer's side, bypassing the public grid.
- return on net assets
- A financial metric commonly used by large companies that pushes them to spin off or outsource asset-heavy divisions.
How to listen
Founders and investors watching hard-tech startups, aviation and data-center energy — especially anyone who wants to see how a hardware company uses another market to fund its main business.
The first 0:00-4:10 is launch-event-style setup and a promo video; skip to 5:12 for the substance.