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Converting slugs per cubic foot to more tractable units for computing dynamic pressure

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AeroER

Well-Known Member
Joined
Oct 6, 2021
Messages
301
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.)
density from slugs.jpg

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.
 
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