Corrections welcome
Report an Error
This site's whole claim is that its maths is shown and checkable. If your check disagrees with a page here, I want to know.
How to report
Email ianwelkins@gmail.com with:
- the page (its name or URL),
- the exact numbers you entered, if it's a calculator result,
- what you got, and what you believe it should be — with your working or source if you have it.
What happens next
I reproduce the result, check it against the Methodology page and the underlying source, and fix the page if you're right — usually within a few days. Corrections are noted on the page that changed, with credit to the reporter by name or handle, as they prefer.
Not an error but a disagreement with the model itself — the 10-fps-per-inch rule, the drag rate, the spine groupings? Send that too. The limits section of the Methodology page is honest about what is approximation, and a better-sourced approximation is always welcome.