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This is because the Blackbird took off with only partially filled tanks, to lower the weight and therefore the takeoff speed. It was not designed to take off or land with full tanks.

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Also the tanks leaked untill thermal expansion at supersonic speed sealed them.

Wow, shouldn’t that be a safety concern? Fuel leaking all over the airbase prior to takeoff?

The fuel was so resistant to ignition that it required an external source (TEB in this case) to even get alight.

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