## 5 Conclusions  
The best way to enable the reader to reach conclusions and understand the advantages of the designed prototype is to make a thorough comparison with all the products presented in Section 1, which are those, to the best of the authors' knowledge, that are currently in  
Figure 28: Throttle control.  
existence. Therefore, Table 8 presents a summary of all the aspects discussed throughout this document at a glance. PERMITER-8 TM has not been included, as the manufacturers do not produce hybrid generators but complete aircrafts. The available thrust has been calculated for topologies with four, six and eight motors using those with the highest performance in the T-Motors catalogue; the highest value of the three combinations has been chosen for comparison. Power for GE70 has been assigned as 4 kW, although the manufacturer recommends an \"optimal range\" of output power between 2.5 kW and 3.5 kW.  
**Author Contributions:** The results presented in this paper belong to a Ph.D. thesis that was awarded with the first prize in the field of Engineering in the 2020 International Conference of students at the University of Oviedo. The student is [PERSON] and the thesis is co-directed by [PERSON] and [PERSON]. Regarding the contribution of each author, [PERSON] and [PERSON] defined and directed the project and methodology with specific contributions in power electronics and electromechanical design, respectively. [PERSON] was involved in the whole project. [PERSON], a specialist in the field of Energy Storage Systems and more particularly in SC modelling and analysis, with very recent publications in this field, modelled, dimensioned and defined all aspects concerning the SC array. [PERSON], who received a Ph.D. in Telecommunication, oversaw the monitoring, OSD and data transmission, as well as the digital electronic design for the interface with the power electronics of the generator. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research received no external funding.  
**Acknowledgments:** The authors gratefully acknowledge [PERSON] for his kind and unconditional assistance in the selection and purchase of components, as well as mechanical design. The authors also gratefully acknowledge [PERSON]. for the review and correction of this manuscript. We also gratefully acknowledge Lillith from FoxtechFPVTM for providing us with detailed information about their generator and other products.  
**Conflicts of Interest:** The authors declare no conflict of interest.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **PROOTYPE** & **NOVA2400** & **HYBRIX** & **AEROHYB** & **GE70** \\ \hline Dry weight & 9.2 kg & 5.6 kg & N/A & 5.6 kg & 3.5 kg \\ \hline Maximum power & 7.75 kw (limited) & 2.4 kW & N/A & 2.4 kW & 4 kW \\ \hline Variable throttle & Yes & NO & N/A & NO & Yes \\ \hline Cooling & Forced air & NO & NO & NO & Water \\ \hline Cooling control & Yes & NO & NO & NO & NO \\ \hline Active rectifying & Yes & NO & NO & NO & NO \\ \hline Active converter & Yes & NO & NO & NO & NO \\ \hline OSD ground system & Yes & NO & NO & NO & NO \\ \hline Backup battery & NO & Yes & Yes & Yes & Yes \\ \hline DC Bus stabilization & Yes (SC array) & NO & NO & NO & Bat. \\ \hline Integrated digital & & & & & \\ control & Yes & NO & NO & NO & N/A \\ \hline Programmable & Yes & NO & NO & NO & NO \\ \hline Coupling & Direct elastic & Gear & N/A & Gear & Direct \\ \hline UAS Flight & & & & & \\ algorithms & NO & NO & NO & NO & NO \\ \hline Estimated thrust & & & & & \\ (approx.) & & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 8: Comparison of all systems with their functions. Indicates only overall base weight.