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Yeap it's insane. Chris Harris did a great video a few years back on the engineering side of things as well as a run in Andy Green's acrobatics plane to give an idea of the forces your body is under during a supersonic run. Its well worth a watch if you haven't seen it.
https://www.youtube.com/watch?v=g4AyytkpiB0
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Supercharged 5.0 xkr engine, before it was a cosworth 2.4 f1 engine.
The engine drives a pump that provides the rocket with fuel (9 gallons? a second or something like that)
EDIT : https://www.bloodhoundlsr.com/ for all the details as they are in South Africa NOW!!!!
See that the Bloodhound SSC project is back on, next test is to get it up to 500mph, but here's a little factoid I've just learned; the jet engine needs so much fuel that it's using a 560bhp Jag V8 as a fuel pump!