@Choo Choo Charlie posted:I would rather have sparks and cinders flying out of the stack.
A simple proxy might be an upward pointing LED hidden in the smoke stack. Here is a photo from a previous OGR thread about BLUE smoke (i.e., diesel combustion).
So the idea is to replace the blue LED with flickering orange LED(s). The fan-driven smoke stream reflects the light providing the illusion that sparks, cinders or whatever detritus are actually spewing/emitting from the stack.
For any determined modelers with time on their hands, I encourage you experiment with illuminating a fan-driven smoke unit's stream with strategically placed tiny surface-mount LED(s) near the output. For example, here's a 1:48 scale model F-14 Tomcat jet engine LED-illuminated after-burner with and without smoke:
And here's an orange LED hidden in the tip of the 88 gun on a King Tiger tank. Flame burst effect is much more dramatic in the dark, but the idea is to use the exhausting smoke puff to reflect the LED flash which greatly multiplies the illusion.
