Interactive Tools

Things a page in a book can't do. Play with the numbers, click through a decision, fill in your own notebook.

Gear Ratio & Speed/Torque Calculator

Model wheel size, gear ratio, and motor count together and see the speed vs. torque tradeoff instantly.

Answer a few questions about your game element and get pointed toward the mechanism types worth prototyping.

Competitions, deadlines, and build sessions with a countdown to the next one, exportable to your calendar.

Fill in a decision, a log entry, or a reference note the same way the book's notebook system is structured, then export it.