In the previous article in this series, ‘Open Source Model Rocket: Design And Simulation (Part 1),’ published in June issue, the model rocket was designed using simulation software and its performance was evaluated through virtual flight tests. Building on that work, Part 2 covers the assembly process, circuit connections, flight computer programming, and testing, culminating in the construction of a physical model rocket based on the earlier design.

Part 2 focuses on the rocket’s electronics and stabilisation system. Sensors measure altitude and detect changes in motion, enabling the controller to actively stabilise the rocket by adjusting the aerodynamic fins during flight. The controller can also be programmed to modify the rocket’s flight path according to a predefined trajectory.

To ensure reliable flight, proportional-integral-derivative (PID) tuning is performed for self-balancing and fin stabilisation. This enables the rocket to compensate for wind, turbulence and other external disturbances while maintaining its intended flight trajectory.





While full-scale rockets rely on dedicated flight computers, this model uses a simple microcontroller and straightforward programming to implement the same core functions. During testing, the system transmits real-time flight data and fin-control commands over Wi-Fi within its operating range. For longer-range operation, a dedicated telemetry module can be added to transmit flight data to a ground station or another receiving device.

Fig. 1: Assembled open source model rocket with detachable nose cone

Fig. 1 shows the assembled open source model rocket with a detachable nose cone, while Fig. 2 shows the author’s model rocket prototype alongside its OpenRocket simulator design.

Fig. 2: Author’s model rocket prototype and design in the OpenRocket simulator

To build this system, the required components are listed in Table 1 and Table 2. Table 1 presents the bill of materials for the rocket body, while Table 2 lists the

📌 Open Source Model Rocket: Design and Simulation (India)
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