Increasing stack draw with an airfoil top cover?

[Tallbald]

I think I read about someone doing this somewhere at the beginning of my smoking journey. But I can't find it. Maybe a false memory?
Anyway, think about this please. The shower curtain billows inward when the shower head is shooting out water. Years ago I learned this was because fast moving air has a lower pressure than still air. An airplane wing is curved on top causing air to move faster and a lower pressure on top, with lift up on the flatter underneath surface.
This fella found that a curved "airfoil" shaped top over his stack at the top caused a slightly lower pressure below the cover that he said literally helped suck air flow through the stack increasing air being drawn into the firebox.
Anyone here familiar with this? Don't reckon it would hurt. Nice to have a cover for rain showers popping up without having to shut the damper.
Don.

 

[indaswamp]

Could always just make a taller stack for more pull....

 

[Tallbald]

Well I have made the stack taller. Problem is, it remains 3 inches in diameter. In asking about the air foil I guess I'm looking for an edge. I enjoy modifying things too. Don.

 

[indaswamp]

There is such a thing as too much air flow-especially with sausage where you can get case hardening.