OF
Well-Known Member
I think you are always going to have a spot on the coil that is going to be hotter.
It is still not perfect but judging from the looks of my load, it is applying heat more evenly than before. Still need to stir to avoid waste.
Perhaps with the current configuration uneven distribution is necessary, but for sure it doesn't have to be that way. In fact, it's pretty natural to be uniform. Here we have, I think, a case where the airflow pattern is the real issue. The coil itself is quite uniform and can be easily modified by turn spacing to change that. Bending it down also may do this, may not? The problem is the airflow is off center and not uniform I think. It's basically all at the back. Most of the air (volume wise) blasts straight up to the load, having minimal time near the coils. The remainder slows more, passes through on angle, spends more time near the heat and comes out hotter for it.
The problem is, this effect changes a lot with draw speed as has been pointed out. Just backing off on the draw can slow the flow enough so it goes over temperature and we get combustion instead of less heat in the load as you'd expect. Normal feedback fails by calling for the wrong correction.
So, at best, I think we can tune for one draw speed? We also know that at least some of the hot air can be way over what the setting says it is. I've never combusted at 330F before......least as I recall.
All in all a fun and useful thing, I think. But as so often happens only some experience from other vapes carries over.
OF