Interest in the exploration and exploitation of the stratosphere is rapidly growing, particularly for future Earth Observation and Telecommunication applications. In this context, Stratobotic aims to develop solutions based on a blended configuration that combines a fixed-wing UAV, an innovative airship, and a stratospheric balloon, both filled with lighterthan-air gases such as Helium or Hydrogen (He/H2). The company goal is to improve the operational autonomy of these systems by remaining weight compliant, as per European regulation ((EU) 923/2012 – SERA). The objective of this thesis is the design, modeling, and prototyping of an innovative power harvesting system capable of increasing flight autonomy, thereby overcoming current technological limitations.