Originally posted by FredT
Cool. The reason I asked is the following: Im a avid fan of the SR-71/A-12 and can't remeber if they left contrails at operational altitudes.
Old post I know, but worth clarifying anyway...
The SR-71 and A-12 aircraft had a periscope for the pilot to see behind him, and one of the operationa parameters they had to meet before entering the
'sensitive area' was that they were not producing a contrail. If they were, they would adjust the flight parameters to reduce or eliminate it
(accelerate, slow down, change height et al).
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