Well, speaking of Nazi wunderwaffe, they actually have... one. N-stoff, the chlorine trifluoride.
This hellish substance ignite/combust basically anything in came in contact with. Concrete, sand, asbestos, water... It's hypergolic with almost everything you could imagine. Also, its extremely corrosive, quite poisonous, and while burning, release toxic fumes.
As far as I know, the main reason why Nazi did not attempt to actually use it, was because they weren't actually able to figure out how to transport it safely.
That stuffs scares the peewadens out of me
en.m.wikipedia.org
I knew that one was familiar ! Yes, indeed it is one hell of a bastard stuff (sorry for the swearing) including for rockets.
There is a dated (1971) but still reference book called "Ignition !" by rocket scientist John Clark, who explains in a very witty way how every single rocket propellant combination, even the nastiest ones, were explored.
The all time record is still 542 seconds (in the laboratory. Don't try that at home, nor at Cape Canaveral !) for a combination of hydrogen - lithium - and (drums rolling) - N-stoff you mentions.
Yowza - liquid hydrogen is damn cold, low density, explosive. -270°C
Lithium is, well, lithium: flammable and the like.
And N-stoff is... well, John Clark summarized it in one legendary sentence
"...the problem of coping with a metal-fluorine fire ?
... for dealing with this situation, I have always recommended a good pair of running shoes."
ROTFL.
Lithium, boranes and fluorine are rocketry three red herrings. Surely enough, they make your chemical rocket specific impulse shine. Unfortunately, all three of them can be aptly described by that wonderful Ian Malcolm quote from the Jurassic Park sequel (1997:
The Lost world)
"
Yeah, oooh, aaah, that's how it always starts. Then later there's running, and , eeerhm, screaming." LMAO.
But make no mistake, Glushko and other Soviets rocket scientists couldn't help dreaming about large engines fed by such nasty substances.
As if the prospect of an UR-700, RD-270-powered crash weren't nightmarish enough (
5000 tons of N2O4 / N2H4 !) Glushko wanted to throw
boranes into the fray to get 40 seconds more specific impulse.
Then again, NASA just couldn't resist the lure of fluorine/methane having the same isp than LH2/LOX, except without goddam LH2 storage issues: bad density, horrible temperature...
Except fluorine was even worse, at least for toxicity. Yet the NTRS is packed full with dozen of studies of Fluorine/methane RL-10s and Centaur-like stages.