The equation is probably close enough for your setup. I'd guess that the effect of the brick not being a point load and the deflection measurement not being exactly centered would be less than 5%. Don't forget that most of these numbers have some type of units, and the units need to be consistent.
edit: If you're really interested in the physics and math, I'd recommend the Gore/Gilet books.
http://www.goreguitars.com.au/main/p..._the_book.html
__________________
Rodger Knox, PE
1917 Martin 0-28
1956 Gibson J-50
et al
Last edited by Rodger Knox; 10-10-2017 at 11:35 AM.
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