Quote:
Originally Posted by carambola
If you figure an incomplete burn in the jet engines, there is technically something being left behind.
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Gas Turbines and Jet Engines (flying gas turbines) are run "lean". Combustion is usually complete. You get CO2 and H20, some NOx.
In the "old" days, some of the jets left carbon trails, mostly due to mechanical atomization (high pressure fuel). Heat vaporization (using fuel candy canes in the combustion zone) solved it. These days, high pressure air is used for atomization.