Black Smoke "Hummers"

Huppscustom
Updated formula (Gen II) for heading style hummers using potassium chlorate and moth balls. Made lots of black smoke and spin up nicely. Pretty happy with them. Can't believe how long they go and the vent hole isn't eroded at all.
The video sounds like they sputtered but they didn't sound that way to me in person. I don't know if that is just a Odd physics thing or if it is just my hearing.