SR-71 used JP-7. It had to be vaporized before introduction into the engine. If you threw a match into a bucket of this stuff, it would be snuffed immediately.
It was just the engines that had to be replaced. Due to a limited budget, the MiG 25 used little (if any) titanium. Since the planes were constructed mostly of steel, pilots were strongly discouraged from pressing the limits as this was HIGHLY stressful on the airframe itself.
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SR-71 used JP-7. It had to be vaporized before introduction into the engine. If you threw a match into a bucket of this stuff, it would be snuffed immediately.
It was just the engines that had to be replaced. Due to a limited budget, the MiG 25 used little (if any) titanium. Since the planes were constructed mostly of steel, pilots were strongly discouraged from pressing the limits as this was HIGHLY stressful on the airframe itself.