Quote:
Originally Posted by speculum jockey
They're all pretty much the same. Big row of cylinders igniting avgas in them and venting the exhaust out the pipes in the side. Unless there was some sort of addidive that would change the colour (not likely) then they'd all be blue like you're suggesting.
The flashes are one reason why some 109's had the exhaust shield covering the pipes, so they would not be seen in low-light conditions, but as oleg just mentioned there are other factors at work.
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I already corrected myself after Oleg's post.