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Quarter Inch thick Iron Blast Plate after being hit with the power of the M engine. No engine residue was found on the launch pad's legs - So the plate really worked well. I'll sand it down and repaint it.

The oxidation and engine residue can be seen even on the rod holder(pipe) crease as well as all the way up the pipe.

The white scorch part is 3.5 inches in diameter. When launching with a K motor, there is a scorch of about 0.75 inches.