Studies of the aircraft's titanium skin revealed the metal was actually growing stronger over time due to the intense heating caused by aerodynamic friction, a process similar to annealing.
Major portions of the upper and lower inboard wing skin of the SR-71 were actually corrugated, not smooth.
The thermal expansion stresses of a smooth skin would have resulted in the aircraft skin splitting or curling.
By making the surface corrugated, the skin was allowed to expand vertically as
Z'all the scrap • ø Ø Þ One Day we will find out what to write here
UPDATE-2:nothing PC
UPDATE-3:for the lazy man
UPDATE-4:Mars Venus
º Cilacap, Indonesia º
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