How to Design and Simulate a Rocket in OpenRocket

OpenRocket is a free, fully featured model rocket simulator that lets you design and simulate rockets before building and flying them. To design and simulate a rocket, you work in the 2D and 3D design views, add components either from the built-in commercial parts database or as custom parts, select a solid rocket motor, then run a simulation and review the results through plots and exports. This workflow fits anyone who wants to validate stability, altitude, and flight behavior before committing to a physical build.

Designing the Rocket

Work in the 2D and 3D design views

OpenRocket uses CAD-style design tools. The 2D Design View is where you assemble and adjust the rocket's structure, and the 3D Design View lets you see the result as a three-dimensional model. You can also create 3D renders of your designs.

Add components

You have two routes for building out the airframe:

• Select commercial parts from the component and materials database.
• Create custom components and save them for reuse later.

You can replicate all features of an existing model or a new design, down to the density of materials and the quality of finish on the outside of the model. When the design is ready, you can export your design drawings to PDF for building.

Watch real-time performance feedback

As you work in design mode, performance data updates in real time. This includes:

• Center of pressure
• Center of gravity
• Maximum altitude
• Max velocity
• Stability

The effect of each change appears the instant you make it, so you can fine-tune the design as you go.

Handle staging and clustering

Staging events are supported. You can incorporate multi-stage flights, dual deployment, and other event triggers into your design. Clustering is also supported: arrange a cluster automatically via several preset configurations, then tune it to match your exact needs.

Choosing a Motor

Select your solid rocket motor from an extensive database. The site notes you can "choose the best and safest motors for your" rocket, so motor selection is part of the design workflow rather than a separate step. Match the motor to the design's goals before running simulations.

Running Simulations

OpenRocket uses Six-Degrees-of-Freedom flight simulation with over 50 variables. The simulation can:

• Accurately model wind at different altitudes
• Script custom extensions to simulations
• Optimize your designs for certain goals
• Provide more detailed insights into aerodynamic performance
• Export your design to various formats

Use the optimizer

Beyond tweaking the model with real-time feedback in design mode, there is a rocket optimizer tool that can automatically adjust parameters given an optimization goal. Use it when you have a specific target (for example, higher altitude) and want the tool to search for parameter values rather than adjusting them by hand.

Reviewing Results

Analyse all aspects of your simulation with advanced plotting and exporting. The plots are where you check whether the design met its goals — altitude, velocity, stability, and the other variables the simulation tracks.

Getting OpenRocket

Download v24.12 from the site. Builds are listed for:

OpenRocket is open source. The site also links to documentation (User Guide, Developer Guide, Technical Docs, Release Notes), tutorials, a Discord community, and a rocketry forum for support.

Common Sticking Points

• Stability warnings during design: because center of pressure and center of gravity update in real time, watch them as you move components rather than only at the end.
• Motor choice: the motor database is extensive, so filter by the flight profile you want before running a simulation.
• Complex flights: multi-stage, dual deployment, and clustering are all supported, but each adds event triggers you need to configure rather than relying on defaults.