"I guess the non-rigid craft to semi-rigid, air ships, dirigibles, aerostats, have similar configurations using some form of propulsion, however. If such craft are heavier then air aerial aircraft, then the propulsion system would garner a more…"
"A blast of smoke, expulsion of fumes, exhalation of fire, ejection of flame,
My pleasure to help Contessa. Tell you what why not call by Scribblers Den also in the Empire there are much more talented writers there than little old…"
In a word is hard. jetsam perhaps.
In a phrase perhaps: Exhaust gasses ejected in the back wash of the propellers
jettisoned fuel discharging and igniting forming a jet-stream of fire.
Hope this helps! Steve"
"Need help with some phrasing... in mentioning a dirigible in the air floating about in the London sky, I don't know what the word is to describe the blast of something that would come out of the back of it. Backfiring? A puff of what?…"