Open Source
Liquid Rocket Motors
Half Cat Rocketry is an organization dedicated to developing affordable and reasonable amateur liquid rocket propulsion systems. Our goal is to make liquid rockets accessible to students and individuals by publishing information on design, build, and launch.
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41 Launches | 40 Static Tests
First firing 15 December 2020
4 Launches performed in one day
Featured
Latest Activity
Mojave Sphinx at BALLS 32
Mojave Sphinx launched four times at BALLS 32 in September 2024, three on SN 04 and once on SN 01, making the event the first time in decades that liquid bipropellant rockets were allowed to launch at a Tripoli event.
HCR-5100
The Mojave Sphinx guidebook has officially been released, allowing students and individuals to build their own rocket with confidence that it will be successful.
Mojave Sphinx Drag Race
Mojave Sphinx serial number 01 and 04 performed the first liquid rocket drag race ever in October 2024, launching simultaneously to nearly identical altitudes.
Support Half Cat Rocketry
Rocket engines are expensive, and they take time. We’re dedicated to providing the rocketry community with a totally unique and open-source architecture, but it comes out of our own pockets and hours in the day. If you find our work to be useful, please consider making a donation to support our efforts.
Contact Us
We’d love to chat with you - send us a message through our contact form or message us on Twitter or Discord.