NORMAL CONTRAIL PHOTOGRAPHS
Santa Fe, NM May 1999
Provided for Control Purposes
This contrail sequence of four photos was taken over a 45 second interval.
Notice the gradual formation of the contrail, and the dissipation of the trail within approximately a 45 second interval. The camera was held stationary on the contrail after the plane passed. Notice none of the trails are coming directly from the tail of the airplane.
Here is another normal contrail, notice the gradual formation as it cools from the engine, as opposed to forming discretely at the tail surface: