# Topics

- [Initial sizing](/topics/initial-sizing.md): The aim of the initial sizing is to come up with a design which is light, performs well, and is inexpensive to manufacture and operate.
- [Definition of axes and angles](/topics/definition-of-axes-and-angles.md): The aim of this topic is to explain the commonly used axes for aircraft simulation and aerodynamic analysis.
- [Stability](/topics/stability.md): The aim of stability analysis is to determine if a design is statically and dynamically stable.
- [Obtaining stability derivatives from forced oscillations](/topics/stability/obtaining-stability-derivatives-from-forced-oscillations.md): This article explains how to obtain the stability derivatives of a design from forced oscillations
- [Equations of motion](/topics/equations-of-motion.md): The aim of this topic is to explain how the six-degrees of freedom equations of motion with respect to rotating Earth are derived
- [PX4 Autopilot](/topics/px4-autopilot.md): The aim of this topic is to provide more information on software-and-hardware-in-the-loop simulations with the PX4 Autopilot.
- [Building and running PX4 Autopilot on BeagleBone® Blue](/topics/px4-autopilot/building-and-running-px4-autopilot-on-beaglebone-r-blue.md): This article will explain how build and run the PX4 Autopilot on BeagleBone Blue.
- [PX4 BeagleBone® Blue-based quadcopter](/topics/px4-autopilot/px4-beaglebone-r-blue-based-quadcopter.md): This article shows how to build a PX4 BeagleBone® Blue-based quadcopter