== Introduction and Overview Welcome to the Altus Metrum community! Our circuits and software reflect our passion for both hobby rocketry and Free Software. We hope their capabilities and performance will delight you in every way, but by releasing all of our hardware and software designs under open licenses, we also hope to empower you to take as active a role in our collective future as you wish! Thank you for your interest in motor testing products from Altus Metrum. Our first such product is EasyMotor, an in-flight motor data collection board for hobby rockets. EasyMotor is a small circuit board that is meant to log motor chamber pressure and rocket acceleration during flight. With this data it's possible to determine whether a research motor is performing as expected. With additional information about masses and airframe drag, it is even possible to closely estimate complete motor performance. With EasyMotor, the dilemma of “do I burn this on a test stand to learn more about how it actually works, or do I go fly it” is no more! You can fly your motor and get real performance data about it too! Because documentation is just as prone as software to contain “bugs”, and can always be improved… If you have questions that aren't answered in this manual, or just need a little help figuring things out, we strongly suggest joining the Altus Metrum user email list, which you can do by visiting https://lists.gag.com/mailman3.