This project documents an amateur-built liquid-fueled rocket engine and flight vehicle, including engine project pages.
Half Cat Rocketry
Half Cat Rocketry shares open-source liquid rocket motor information and resources for amateur rocketry.
About Half Cat Rocketry
Half Cat Rocketry is an organization dedicated to making amateur liquid rocket propulsion systems accessible to students and individual hobbyists. It shares open-source resources covering liquid rocket design, construction, and launch processes, with a core mission of lowering the barrier to entry for non-professional rocketry enthusiasts.
The group publishes practical guides, simulation tools, and public performance data from its own testing work, including more than 100 total motor firings, 47 launches and 53 static tests completed since its first test in December 2020. It also maintains a public Discord server for community discussion, and accepts voluntary donations to support its ongoing development of affordable amateur liquid rocket systems.
Key features
- Publishes open-source amateur liquid rocket design, build and launch resources.
- Offers the Mojave Sphinx Guidebook for amateur liquid rocket builds.
- Provides HalfCatSim simulation tool for liquid rocket design testing.
- Maintains a public Discord server for rocketry community discussion.
- Shares public records of 100+ firings, 47 launches and 53 static tests.
Best for: Students and amateur rocketry enthusiasts seeking accessible liquid rocket propulsion resources benefit most.
Good for
- Free, open-access resources for amateur liquid rocket development.
- Proven track record with over 100 successful motor firings.
- Active community support via public Discord and published guides.
Watch out for
- Resource development relies on volunteer labor and public donations, which may limit output speed.
Half Cat Rocketry at a glance
- Website
- halfcatrocketry.com
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Half Cat Rocketry alternatives
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John Coker shares information about model and high-power rocketry through his rocketry site.
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Half Cat Rocketry FAQ
Is Half Cat Rocketry’s content free to use?
Yes, all design guides, simulation tools and public test data are available for free on their website.
What is the Mojave Sphinx Guidebook?
It is a published guide providing step-by-step instructions for building a successful amateur liquid rocket, released by Half Cat Rocketry.
Does Half Cat Rocketry have a community space for users?
Yes, they operate a public Discord server for discussing amateur liquid rocketry and asking project questions.
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