Quote:
Originally Posted by Sutts
Perfect find fireflyerz, thanks for posting. Must have had the mixture bang on in this run up, lots of blue and more blue. A brief flash of orange/yellow flame on initial start - just like in the 1st Oleg video.
A red flame from a single stack at one stage I noticed.
I was so glad when they turned the lights off. No illumination of the side panels at all really - maybe very slight at one point but just immediately around the stacks. Best video yet.
Cheers
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The flame color is a product of the temperature (that whole quantum-mechanics stuff). For these engines one of the biggest factors is the mixture.
A leaner mixture will result in higher temperature (and higher power) - which results in flames on the blue side.
A richer mixture will result in lower temperature - so the flames go to the orange/red side.
In my experience with Cessnas, you would start the engine at full rich fuel mixture. I would think most engines would be started at full rich, and leaned afterward.
In a new engine, this would probably result in yellow flames on startup. Once the engine is leaned, it would go toward blue.
The only thing about these videos is they are showing old aircraft with old engines. I would suspect that the conditions of individual engines (even different cylinders on the same engine) and the fuel systems probably play into why some videos show a variety of colors.
I would hope that different flame colors are modeled (blue - orange/red), depending on the engine conditions.