"It's a zippy little thing, carries liquid hydrogen,"
Ha Ha Ha. Piece of unconscionable crap. Do you drive up to a European Space Agency launch pad, put on your protective cryosuit, suspend life and auto insurance, pray to everybody's gods there isn't the tiniest of leaks and a spark of static... Do you garage it? BOOM! Boil-off.
Have you ever worked with cryogens, even liquid nitrogen?
Do you have any idea how dangerous liquid hyrogen is? If you get in an accident and breach its dewar the physical explosion will kill you, followed by a chemical explosion that will level the surroundings. BOOM! The smallest leak - a physical imperfection in the plumbing or a virtual leak through elastomer - will kill you. BOOM!
I've worked in a place plumbed for hydrogen to do quartzblowing. When a line did not hold static pressure the whole facility was wetted own with shampoo in water - and nobody complained about looking for the leak. BOOM!
The H*Y*D*R*O*G*E*N car. Ha Ha Ha. Here's a hint, lady - when you liquefy hydrogen 1/3 of it will boil away in storage as it slowy undergoes ortho to para spin conversion. You need an in-line paramagnetic filter and another liquefaction stage to succeed. If the average 100 IQ git handles hydrogen, liquid or otherwise, he will die - and good riddance. BOOM!
Other than that the will emit loads of nitrogen oxides, NOx, because hydrogen burns hot. Brown skies, baby.
