Engineering editorial and review methodology

Technical verification states

1. Source checked: governing reference traced to a named source category.
2. Equation checked: equation independently compared with that source.
3. Units checked: dimensions and input/output conversions checked independently.
4. Numerically validated: independent expected-value and edge/invalid-input tests pass against the engine.
5. Visual QA passed: required responsive sizes checked for readable annotations and material overlap or truncation.
6. Published: page satisfies the central publication manifest requirements.

Formula selection and scope

Start with the engineering question and its governing physical relationship. Record the formula, variables, input and output units, applicable conditions and excluded effects. A basic power or stress estimate must not be described as complete equipment selection or code-compliant design.

Independent numerical checks

The release protocol requires expected results derived separately from the implementation. Record normal, small and large reasonable cases, unit conversion, invalid, zero and negative inputs, and alternative solve-for modes where supported. Define the tolerance before comparing results, including formula approximations and displayed rounding. A failed case blocks search publication until corrected and retested.

Verification evidence is stored alongside source code and regression cases, with dates tied to completed checks.

Units and worked examples

Trace each conversion from the selected input unit to the engine unit and then to the displayed result. Distinguish mechanical horsepower from metric horsepower. Check dimensional consistency and compare a worked example against an independent reference result rather than using the calculator to generate its own expected answer.

Source provenance

References are categorized as STANDARD, TEXTBOOK, MANUFACTURER DATA, MATERIAL DATA, ENGINEERING HANDBOOK or DESIGN ASSUMPTION. Record the title, edition or revision where known, relevant section, source link and the specific value or relationship supported. An unverified edition or value is marked as unresolved.

Material properties must identify grade, condition, temperature and source when these affect the result. Nominal densities and example strengths are not product certificates. User-selected coefficients and illustrative inputs are design assumptions, not verified material data.

Standards references provide metadata and scope only. Citing a standard does not certify a calculator or prove compliance; copyrighted tables and substantial standard text are not reproduced.

Technical and visual release review

The reviewer checks result interpretation, assumptions, limitations, related calculations and redundant content. The visual protocol covers 375, 430, 768, 1024, 1440 and 1920 pixel widths, including input use, equation readability, SVG dimensions and overflow. Passing a build or an overflow check alone is not a visual sign-off.

Until the required evidence is complete, useful tools remain accessible with search indexing disabled. Search eligibility does not imply that Google will index or approve the site.

Corrections and human review

Report the calculator URL, inputs and units, actual result, expected result and supporting reference. Reproduce the issue, add an independent regression case, correct the engine or explanation, and record the affected scope before restoring search eligibility. Review dates must describe work that actually occurred.

Technical verification documents formula, unit, source and numerical checks. It is not professional engineering certification and does not approve a specific real-world design. Named human review is recorded only when it actually occurred.