2 Select the subsystems

The next step is to select the subsystems that will meet the mission requirements and specifications. You need to choose the type, configuration, and characteristics of each subsystem, such as the engine, propellant, tank, nozzle, valve, pump, battery, solar panel, antenna, sensor, actuator, computer, software, fairing, and structure. You need to evaluate the performance, efficiency, compatibility, and availability of each subsystem, as well as the trade-offs and risks involved. You also need to consider the interfaces and interactions between the subsystems, such as the mechanical, electrical, thermal, and data connections.

3 Design the subsystems

The third step is to design the subsystems that will achieve the desired functionality and performance. You need to apply the physics, engineering, and design principles and methods to each subsystem, such as the rocket equation, mass budget, thrust-to-weight ratio, specific impulse, drag coefficient, center of gravity, center of pressure, stability margin, control authority, power budget, thermal balance, signal-to-noise ratio, and error analysis. You need to use the appropriate tools and techniques to model, simulate, optimize, and verify the subsystems, such as the CAD, CFD, FEA, MATLAB, Simulink, and Monte Carlo methods.

4 Test the subsystems

The fourth step is to test the subsystems that will validate the design and performance. You need to conduct various tests and experiments to measure and evaluate the subsystems, such as the static fire, vibration, acoustic, thermal vacuum, shock, electromagnetic interference, and functional tests. You need to use the proper equipment and facilities to perform the tests, such as the test stand, dynamometer, shaker table, anechoic chamber, vacuum chamber, and data acquisition system. You need to analyze the test results and compare them with the design expectations and mission specifications.

6 Launch the rocket

The final step is to launch the rocket that will execute the mission. You need to prepare and transport the rocket to the launch site and install it on the launch pad. You need to perform the final checks and countdown procedures to ensure the readiness and safety of the rocket, the payload, and the ground systems. You also need to monitor and control the rocket during the launch and flight phases, as well as the payload deployment and operation phases. You need to collect and analyze the flight data and evaluate the mission outcome and performance.