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Damn my memory for not retaining sources, just the notes...But I remember that the story was that after assembly, an Il-2 needed to sit for a day for the concrete to cure before flying.Done that before in welding class. Burning acetylene with just atmospheric oxygen leaves a very smokey flame and you can lay the smoke down on the metal to cover it with a layer of soot. Then you go back over the plates with a oxy-acetylene flame and watch the soot disappear.
Damn my memory for not retaining sources, just the notes...
But I remember that the story was that after assembly, an Il-2 needed to sit for a day for the concrete to cure before flying.
Done that before in welding class. Burning acetylene with just atmospheric oxygen leaves a very smokey flame and you can lay the smoke down on the metal to cover it with a layer of soot. Then you go back over the plates with a oxy-acetylene flame and watch the soot disappear.
