Friday 2010-12-10 Dev. video update and Discussion

[Rodolphe]

Originally Posted by changai

Actually, Winny is right, it doesn't depend on those factors.
Color is related to the temperature of gases produced during combustion: the hotter, the whiter; the colder, the redder. Blue indicates a very high temperature. Near-perfect combustion of hydrocarbons is always blue.

Yellow indicates an imperfect combustion, i.e. lack of combustive agent (usually air) which causes production of soot, i.e. smoke. However, even a very rich mixture as used on a cold engine would not produce yellow flames, but add a yellowish hue at the end of blue flames.

Red indicates a very bad combustion. A damaged engine burning oil would probably produce reddish flames.

Hope this helps

Welcome Changai.

Thanks for your first post here, and I can say that you are Spot On !

Following the A.P. 1565 A (Spitfire I, Merlin II or III engine) 'STARTING THE ENGINE AND WARMING' procedure, the mixture should be in Full Rich with a 1/2 inch open Throttle , not quite a blue near-perfect combustion situation.

On this 'September Fury' dusk video, the blue flames panache appears only at a continuous high power regime.
Note the absence of blue light reflection on the 'Fury' fuselage.


and by the way, thanks for the Update. ; )


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