I'm using a JR9303. Smoke is on AUX3 which is controlled by the right hand slider, so we can vary the smoke manually from a thin whisp to billowing clouds. I've tapped into my 4400 mah ecu pack for power.

One advantage an internal engine like the F-16 has is that it has that long exhaust pipe to mix and vaporize the smoke fluid. And even with one tube, there is still some liquid that makes it all the way through and drips off the end. With external mounted engines, you might have to play with a bit to get the desired effect.

Oh, and smoke oil is messy! Make sure your overflow drain is below the aircraft!