Automotive

Cryogenic hydrogen SCG Boot off-roader aims to recast fuel cell tech

Cryogenic hydrogen SCG Boot of...
To save room for the hydrogen tank in back, SCG puts the spare tire up front and peels the headlights way back
To save room for the hydrogen tank in back, SCG puts the spare tire up front and peels the headlights way back
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SCG gets a little more serious about its hydrogen-powered Boot, showing an all-new look for the zero-emissions Baja racer
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SCG gets a little more serious about its hydrogen-powered Boot, showing an all-new look for the zero-emissions Baja racer
To save room for the hydrogen tank in back, SCG puts the spare tire up front and peels the headlights way back
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To save room for the hydrogen tank in back, SCG puts the spare tire up front and peels the headlights way back
Some serious cooling for the cryogenic hydrogen fuel cell system
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Some serious cooling for the cryogenic hydrogen fuel cell system
The gas SCG Boot at the 2021 Baja 1000
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The gas SCG Boot at the 2021 Baja 1000
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Trying to race 1,200 miles (1,931 km) of notoriously harsh, prickly desert is difficult in itself. Developing a first-of-its-kind zero-emissions fuel cell off-roader to complete the task is more difficult still. Skipping common compressed-gas hydrogen in favor of cryogenic liquid hydrogen so bleeding edge you can't even source it for testing, let alone pump it into your 4x4 ... well, that's just lunacy. But if your resume already includes an entry titled "Frankenhooker," your screws are probably loose enough to give it a go. Or that's the case at Scuderia Cameron Glickenhaus (SCG), anyway. The company's plans now call for its hydrogen-powered Boot Baja racer to run on liquefied hydrogen, which stores at -423 ºF (-253 ºC) and ignites with the tiniest of sparks.

Last time we looked in on it, SCG's fuel cell Boot was a fairly nondescript crew cab pickup truck with its rear seats swapped for hydrogen equipment. Half a year later, it's an absolute beast of a thing with a front-mounted spare tire, exo-cage, headlamps pulled back nearly to the windshield and a bed filled up with a rendered-in hydrogen tank.

We emphasize "rendered" not merely because we're looking at early renderings instead of photos, but because Glickenhaus hasn't yet figured out how exactly it's going to carry the liquefied hydrogen on board. So it's basically just coloring in a cool-looking metal tank protected by a gnarly bed cage.

SCG gets a little more serious about its hydrogen-powered Boot, showing an all-new look for the zero-emissions Baja racer
SCG gets a little more serious about its hydrogen-powered Boot, showing an all-new look for the zero-emissions Baja racer

"There are no FIA regulations for off-road hydrogen safety, no NHTSA regulations for road vehicle safety, only four or so labs that can even test at cryogenic hydrogen temperatures in the entire United States, no existing onboard tanks that meet our needs, no refueling infrastructure," SCG admitted bluntly in a creative Q&A-style announcement this week. "Hell, we have not yet been able to source cryogenic hydrogen for testing."

So why on earth is the company pursuing cryogenic hydrogen to power a vehicle that's going to smash its way through open desert? From what we can glean from the announcement, SCG sees its role as being a small, race- and high-end road focused shop that pushes boundaries and comes up with new ideas that mainstream auto won't touch – in this case developing the knowledge and means for using cryogenic hydrogen as a viable automotive fuel.

"Glickenhaus Zero builds the future of transportation, so we don't make existing things," the company emphasizes.

The advantage in using liquid hydrogen lies in its superior energy density, at least by weight. Liquid hydrogen has a density of 120 Megajoules per kilogram, whereas gasoline packs just over a third of that at 44 MJ/kg. Way down the scale, lithium-ion batteries have a fractional energy density under 1 MJ/kg.

But as we've all known since school age, hydrogen is the lightest of all elements. Liquid hydrogen is, of course, denser than gaseous hydrogen, but it still takes a large volume of liquid hydrogen to get to that kilogram, so its energy by volume drops off significantly. The Hydrogen Storage and Fuel Cells Technologies Office in the US Department of Energy points out that liquid hydrogen has a quarter of gasoline's energy per liter at 8 MJ/L compared to 32 MJ/L for gasoline. That's why liquid hydrogen tends to be stored in huge stationary tanks and transported on tanker trucks ... not two-door Baja pre-runners.

Some serious cooling for the cryogenic hydrogen fuel cell system
Some serious cooling for the cryogenic hydrogen fuel cell system

And storage space is just one among a list of major obstacles facing this project, a list that also includes flammability, energy losses during liquefaction and boil-off during storage. Such obstacles have so far stood in the way of liquid hydrogen becoming the hydrogen fuel of choice for small race cars or street-legal light vehicles, though past efforts have been made. SCG will also need to develop its own refueling infrastructure in order to refill the cryo tank during the Baja race.

Long story short, it sounds like SCG has a world of work ahead of it, especially since it previously indicated it wants to run the hydrogen Boot at the 2022 Baja 1000. It has teamed up with what sounds to be the perfect boundary-pushing engineering partner in Australian-American firm First Mode, which brings experience in working on massive (quite literally) hydrogen challenges.

The gas SCG Boot at the 2021 Baja 1000
The gas SCG Boot at the 2021 Baja 1000

"Today if you consider a hydrogen vehicle, it runs on gaseous hydrogen. The industry kind of just adopted that," Tomás Lafferriere, First Mode's SCG Boot project manager, said after SCG ran the V8-powered Boot in last year's Baja 1000. "There's not a great engineering reason for that. Liquid hydrogen provides quite a bit more energy but running it at any racetrack has never been done before. This is brutally cutting-edge."

Brutally cutting edge, indeed. But what's the point of having an experimental global adventure 4x4 like the Boot if you can't shear off some edges with it?

Source: SCG

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10 comments
10 comments
paul314
Doesn't liquid hydrogen have to warm up before it can ignite?
vince
They had better hope they don't get rear ended. Boom. Big badda boom.
reader
They should look into Nasa's patent licensing offer for cryogenic flux capacitor that uses aerogel to store liquid hydrogen at ambient conditions. Or better yet skip the energy intensive freezing of hydrogen and go straight to Plasma Kinetics solid state hydrogen storage.
GdB
This will fail with the LH2 getting agitated from the off roading and bubbling like soda. The energy absorbed from this better be less than the fuel cell demand!
Chase
I thought no truck could be uglier than the Cybertruck. Not only was I wrong, but I was wrong by an order of magnitude.
vince
Get rear ended and your bug splatter in that vehicle.
martinwinlow
Not quite as much lunacy as is involved in using 100% renewable energy to make H2 destined for use in fuel cell vehicles which puts *at best* 30% of the original renewable energy to the FCV's wheels. And that's ignoring the raft of other idea-killing problems with replacing fossil fuels with H2. Just use the time, money and talent to improve battery technology..... everything else is cheap and off-the-shelf. But try telling that to Big Oil/Gas and their political/golfing chums.
DaveWesely
Where do they get funding for all this nonsense? Oh, never mind. Hydrogen costs 7-10 times more than LPG. Yes it is flammable, but who cares if it goes straight up when released? It is the other stuff, like storage, fueling transfer safety, efficiency, sourcing, and technology development that rule it out. The fact that we are still funding hydrogen research smacks of desperation by the fossil fuel industry.
MARKY
This is a cool idea. I did something like this so my van in Florida. It gets complicated trying to explain about how and why about changing the MAF and MAP. I look at the other big problem vs electric aside from the fueling infrastructure is you are still stuck with an ICE, Trns., etc.
ljaques
Wicked cool looking vehicle, especially WITHOUT the graphics.
That big, heavy, caged tank of H2 on the back doesn't look healthy as far as jumps go, pushing the weight centerline backwards.
Interesting concept, and I wish them luck with it.