Which of the following methods can be used for launching air vehicles in remotely piloted aircraft systems?

Hand launching is a widely used method for launching air vehicles in remotely piloted aircraft systems, particularly for small and lightweight drones. This technique allows for quick deployment and control over the launch angle and direction. It is often favored in scenarios where space is limited and ground equipment cannot be utilized.

While other methods such as cannon launching and rocket-assisted launching exist, they are typically associated with larger or more specialized systems, and may require additional infrastructure or safety precautions. Manual launching is a term that could encompass hand launching but is less specific. Focusing on hand-thrown methods provides a straightforward and accessible way to initiate flight for many remote piloted systems, particularly in hobbyist or training applications.