Tigerfish
Helimutt, Your sense of smell is impressive! But I agree there is a distict whiff in the air!
XX621. If you really are as unaware as you make out, - How do you know it was a twin turbine? Unlike fixed wing where even the most basic of observers can count the engines, to the unitiated most people would not know a single engined machine from a twin!
So you are either press, - starting another rabit to run or a fishing expedition, or were you a genuine casual observer, perhaps looking at a military Chinook going about its lawful business?
Tigerfish