grokkingstuff
Engineering notes, with the working shown.
Overview
This is the published half of an org-roam notes tree — mechanical engineering, CFD, electronics, and chemistry, kept the way they were worked out rather than smoothed into a textbook. Alongside the notes: a set of static calculators for the numbers that come up again and again, and write-ups from actual bench work.
$ site status [ OK ] NOTES 180 [ OK ] LINKS 359 [ OK ] TOOLS 31 LAST EDIT 2026-07-28
PHASE 1 · The question
State the problem
Every note starts from the assumptions and the constraint.
PHASE 2 · The working
Show the equations
Substituted numbers, not just answers.
PHASE 3 · The check
Run the numbers
Calculators that evaluate the same formulas.
Start here
- MechEFastenersOmit the thread pitch and the standard assumes a coarse pitch. Metric bolts come in coarse, fine, and extra-fine…
- CFDNumerical Schemes for CFDNumerical schemes convert continuous PDEs into algebraic equations on a discrete grid, determining accuracy,…
- ChemistryElectrochemistryThis is the landing page for the electrochemistry cluster.
- ElectronicsOptimal Control: LQR, Riccati, and the Kalman FilterAᵀP + PA − PBR⁻¹BᵀP + Q = 0.
Calculators
all 31 →
Ohm's law solver
Reynolds number & flow regime
Sprinkler & fire pump hydraulics (NFPA 13/20)
Bolt tightening torque & shear stress
PCB trace width
Compressible flow (gas dynamics)
Note graph — 122 notes · 359 links
Latest
Blog
Wiki
grokkingstuff · built with org-publish · last edit 2026-07-28