Everything you need to design, simulate and fly better rockets
OpenRocket is a free, fully featured model rocket simulator that allows you to design and simulate your rockets before you build and flying them.
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Recent Releases
23.0911 Jan 2024 02:57
minor feature:
See Release Notes for changes.
22.0205 Jul 2023 20:27
major feature:
The 22.02 release includes hundreds of new features, bug fixes, and UI improvements, more than we could ever fit into one set of release notes. These notes summarize the highlights of the entire release; for more detail consult the notes from the five previous public beta releases.
Please note that version 22.02 is required for Macs running macOS 13.0 or later.
New Features
Rocket design features
Pods and strap-on boosters
Tail cones
Freeform fins on nose cones and transitions
Highly configurable rail buttons
Massive update to parachute configuration and part library
Dave Cook's extensive component library now built-in
Coefficient of Drag Override for components and assemblies (and more flexible override settings in general)
Lots more detailed geometry warnings which identify the components involved
Appearance updates
Settable opacity per-component
Separate left/right appearance for fins, and inner/outer appearance for tubes
App Infrastructure
Packaged installers for Windows, Linux, and macOS (JAR file still available)
Updated to Java 11
Native ARM version for Apple Silicon Macs (snappy!)
File association for ORK files: double-click files to open in the app
On Mac, app stays open after last window is closed
Simulation and Staging Improvements
Assorted CP calculation fixes
Improved nose cone drag calculations
Improved ground hit velocity calculations
Completely reworked tube fin simulation (no longer "experimental")
Improved time step selection for descent
Improved simulation plot appearance
Support for scientific notation and custom decimal places in simulation exports
Simulations now properly account for disabled stages
Update CG correctly when stages are toggled on or off
Display stage names in stage enable buttons
More reliable deployment of booster stage recovery device
UI Improvement
15.0323 Apr 2018 15:44
major feature:
Changes include:
Support for scripting in simulation extensions
Experimental support for tube fins
Custom default mach number
Improved preferences UI
Fin fillet masses (no aero effects though)
Custom icons for different mass types (altimeter, hardware, etc)
Mass in the tool tip on the component tree.
And numerous little bugs and annoyances fixed