Comment Re:Dead end (Score 2) 43
We kind of did.
The original SR-71 was going to be hydrogen powered because jet fuel could self-combust at the kind of temperatures it would reach on board and the CIA had plenty of money to spend to try something new.
They scrapped that idea because the hydrogen version was huge and had limited range and it turned out to be easier to make the jet fuel not self-combust than to make hydrogen work as a fuel. As with all these other fads, there's a reason why we've used fuels that make sense for decades rather than fuels that make some oligarch more money.