Unmanned aerial vehicles (UAVs) are rapidly gaining popularity in various fields, including military, commercial, and scientific applications. One of the challenges in UAV design is the need for reliable and efficient electrical power generation during flight. This paper explores various techniques for generating electrical power in-flight and their advantages and limitations.

• Solar panels are a lightweight and low-maintenance option for generating electrical power in-flight, but their power output is limited by available sunlight and panel size.
• Fuel cells are efficient and can generate high power in small spaces, but require a continuous fuel supply and careful temperature control.
• Regenerative braking is a technique for generating electrical power during descent but is only suitable for certain types of UAVs and requires careful design to ensure safety.