In post four of mcrae0104's project thread -
https://www.homebuiltairplanes.com/forums/threads/mcrae0104-project.28826/
I noticed an error involving units to use for converting air density; it ought to be edited, but I don't know if that is possible now.
"(I promise that if you substitute ft/sec2/ft3 as the units for ρ, the resulting units of q will be lb/ft2)"
Don't do that. This explains the conversion of slugs/ft^3 density to lbf sec^2/ft^4 density for ease in calculating dynamic pressure. (This form is also used extensively in thermodynamics and heat transfer.)
Now simply calculate dynamic pressure in lbf/ft^2 directly without head scratching.
Maybe mcrae0104 has figured this out since his post in 2017, I don't know. He's far from the first to be confused.
https://www.homebuiltairplanes.com/forums/threads/mcrae0104-project.28826/
I noticed an error involving units to use for converting air density; it ought to be edited, but I don't know if that is possible now.
"(I promise that if you substitute ft/sec2/ft3 as the units for ρ, the resulting units of q will be lb/ft2)"
Don't do that. This explains the conversion of slugs/ft^3 density to lbf sec^2/ft^4 density for ease in calculating dynamic pressure. (This form is also used extensively in thermodynamics and heat transfer.)
Now simply calculate dynamic pressure in lbf/ft^2 directly without head scratching.
Maybe mcrae0104 has figured this out since his post in 2017, I don't know. He's far from the first to be confused.