Originally posted by: MyK Von DyK
Originally posted by: Gibsons
I've no idea how to calculate that outside of empirically with smoke or whatever.
I use "sheet of paper" technique Put a low grammature sheet of paper in front (or rather at the back?) of your fan and see how well fan(s) push it away. If you wish you could also measure pressure with simple calculation. Just take into account that pressure raises exponentially with angle the sheet of paper makes. If total pressure for a 90° angle would be p>=mass/area and for 0° angle p<=0 then end formula would be p(0-90°)=sin(angle)*mass/area (I guess, this is plain trigonometry and it has been a while )
EDIT: you also have to account for the fact that total surface that fan's covering also raises exponentially so the end formula would rather look something like this:
p(0°-90°)=sin(angle)*mass/area^
where "area" is sin(angle)*fan size^
giving us end formula: p(0°-90°)=sin(angle)*mass/(sin(angle)*fan size^^).
And even this is not a true formula that would give you any meaningful values ("p" in this case is not any standard unit), it's more for comparison between different setups than anything else...
Best, MyK