Clear evidence exists that adjustment of the throttle or mixture controls effects [sic] trail formation; opening throttle, or richening the mixture often increases the density of a trail.
Finally, Dobson concluded that it was already possible "to issue forecasts of the danger of trail formation whenever cirrus was expected and the temperature was below, say, 220[degrees] a [absolute] at the height of the cirrus." However, such forecasts "would not be entirely reliable since the humidity might be high even when no cirrus was present." (28)
Through experimentation, the presenters determined the following about bubble trail formation
The two J-8s initially began a loose trail formation
but quickly changed tactics and closed on the EP-3E from the rear at the seven o'clock position.
He was number two in a 2-mile radar trail formation
, at 1,500' MSL, in IMC and on a base leg for an ILS approach.
They were in loose trail formation
so I pulled in behind the rear aircraft and gave a "Tallyho" on enemy bogeys.