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It wouldn't get much time to spy at that speed, it has to slow down at its destination and it's fuel limits won't allow great distances without speed changes. Top speed is different from real speed



You're badly misinformed on the SR-71.

> It wouldn't get much time to spy at that speed

That's why you take photos and do the spying part back on base. The SR-71's weapon was its sophisticated camera setup.

> it's fuel limits won't allow great distances without speed changes

When it set its speed record, it crossed from LA to DC on one tank of fuel. (It tanked up immediately after takeoff and immediately before landing, but the cross-country flying part didn't involve a tanker.)




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