From what I've heard, they ocassionally had to make the edge themselves. As in, they reached the bleeding edge, found it fell short of their goal, and extended it on their own.
I suspect it's a much better coolant than most types of fuel. You can apparently extinguish a match in JP-7, and not start a fire. It also didn't just cool the engine nozzles. No, it cooled just about EVERYTHING. It was apparently super-cooled during sub-sonic flight, and got passed through heat exchangers on it's way to the engines, picking up heat from just about every system in the jet. This included the air-conditioning, and the airfoil itself. Then, it would pick up heat from parts of the engine, as it fulfilled it's role in the engines as hydraulic fluid, before finally reaching the engine nozzles and igniting.
The stuff was apparently ~550 degrees by the time it reached the nozzles. And it still needed an additional igniter to get it started burning. It's apparently still made and used, particularly by U2's, though I don't know if they use it anywhere near as extensively or creatively as the SR-71s did.
Holy crap. If the pilot survived that, I'm willing to bet he never lived that down.
Oh, the Nazis were definitely prone to building things without regard for the practicality. The Schwerer Gustav artillery piece, for instance, which was the absolutely massive one with the fire-rate of two shots per hour, at the fastest. Though, to be fair, while it often simply couldn't be brought to bear fast enough to matter, it was pretty damn good at destroying fortifications, when it did actually get to fire on them.
My personal favorite boondoggle of their is the massive manufacturing facility they made to mass-produce chlorine trifluoride. They made about as much of the stuff as they figured they'd make monthly, by the time the Allies captured the place. Which was seven years after it was built. The price tag to make what they did was enormous, too, and they never even used it in combat. Which, given that this is ClF3, which ignites concrete and makes gaseous hydrofluoric acid in the process, is a really good thing.
*shadows. Plural. Also, nix the 's' after 'retreat'.
...What? I have the soundtrack. And have listened to that song a lot.
If I could, I'd give this both a 'funny', and an 'informative'.