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A Hybrid drone is a type of unmanned aerial vehicle using two or more energy sources to power its flight propulsion system.
UAV systems often use brushless DC electric motors as means of propulsion due to their high efficiency and great controllability, their main energy source is usually a LiPo battery with targets for battery packs for electric vehicles of 235 Wh/kg and 500 Wh/L in 2020.[1]
With the present commercially available cells, the multirotor configurations can only sustain an average flight time of 20 to 30 minutes[2] this limits the range of the operations and the usage of such aerial vehicles.
A common solution to this issue is adding a hybrid generator which usually consists of an internal combustion engine coupled with an electric machine, optimized to have a high power-to-weight ratio. The generator transforms the chemical energy stored inside the fuel by converting it to mechanical energy, and then electrical which is then used to power the aircraft.[3]
^Li, Jianlin (ORCID:0000000287109847); Du, Zhijia (ORCID:0000000251780487); Ruther, Rose E. (ORCID:000000021391902X); An, Seong Jin; David, Lamuel Abraham (ORCID:0000000264077897); Hays, Kevin (ORCID:0000000220858202); Wood, Marissa (ORCID:0000000276077640); Phillip, Nathan D. (ORCID:0000000262238765); Sheng, Yangping (ORCID:0000000271703446); Mao, Chengyu (ORCID:0000000222824313); Kalnaus, Sergiy (ORCID:0000000274653034) (2017-06-12). "Toward Low-Cost, High-Energy Density, and High-Power Density Lithium-Ion Batteries". JOM: Journal of the Minerals, Metals and Materials Society. 69 (9): 1484–1496. Bibcode:2017JOM....69i1484L. doi:10.1007/s11837-017-2404-9. ISSN 1047-4838. S2CID 136453831.{{cite journal}}: CS1 maint: numeric names: authors list (link)
^"Sky-Farmers: Applications of Unmanned Aerial Vehicles (UAV) in Agriculture".
^"Design and performance evaluation of a hybrid electric power system for multicopters".
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