In “Fuel Cells: A Real Option for Unmanned Aerial Vehicles Propulsion” some unclarities were detected in several figures shown in Table 2. To clarify the table, for the Horizon Energy Systems/AEROPAK, the weight (3.5 kg) has been replaced only by the FC weight (0.47 kg); therefore, the FC power density changes from 57.14 W/kg to 425.53 W/kg. Also, the FC power of PROTONEX/ProCore VI is changed from 800 W (peak power) to 280 W (output power), which implies FC power density of 686.27 W/kg.
We provide the updated Table 2.
|Fuel type||Manufacturer/model||FC weight (kg)||FC power (W)||FC power density (W/kg)||Application/remarks|
|Chemical hydride cartridge||Horizon Energy Systems/AEROPAK||0.470||200||425.53||IAI Bird Eye 650 LE UAV |
10 A-21 V nominal 600 W with LiPo batteries; cartridge type I: 446 Wh/kg; type II: 607 Wh/kg Also used in Bluebird Boomerang Mini-UAV and Elbit Skylark UAV
|Sodium borohydride||Protonex/UAV C-250||1.2||250||208.33||500 W peak power with batteries|
Fuel 833 Wh/kg hydrated
Cartridge 1.8 kg, 1.5 l
|Compressed H2||Protonex/Spider Lion UAV (NRL)||1.77||95||53.67||Spider Lion Micro-UAV 2005, 3-hour flight|
|Compressed H2||Protonex/Ion Tiger UAV (NRL)||1||550||550||Ion Tiger UAV; 550 W FC (1 kg + 3.6 kg tank 0.5 kg H2), 26 h 1 m flight record in 2009|
Powerplant total weight (including fuel and cooling) = 6 kg. Specific energy 1300 Wh/kg; 26 h endurance
|Compressed H2||EnergyOr/EO-310-XLE||3.95||310||78.48||Radiant Coral Technologies demonstrator UAV 1st flight February 25, 2013 |
Hybrid; the weight includes auxiliary systems
|Compressed H2||EnergyOr/EO-210-XLE||3.65||250||68.49||The weight includes auxiliary systems|
|Compressed H2||DLR/HyFish UAV||3||1000||333.33||HyFish UAV 2007, 0.5-hour flight|
|Compressed H2||UTRC/Gen1||1.78||1200||674.16||Helicopter UAV (October 11, 2009) FC (675 W/kg) Powerplant (500 W/kg) Minicopter Maxi Joker; 20 m flight|
|Compressed H2||BCS/BCS500||6.35||500||78.74||Georgia Tech University UAV 2006 Powerplant weight 12 kg|
|Compressed H2||Horizon Energy Systems/H-100||1.36||100||73.53||Johannesburg University Piper Cub UAV|
|Sodium borohydride||Protonex/ProCore VI||0.408||280||686.27||AeroVironment Puma UAV 2008 Endurance 9 h|
|Compressed H2||Horizon Fuel Cell Technologies||5||650||130||Pterosaur Micro-UAV 2008. Oklahoma State and California State Universities 15.5 h endurance; FC 480 Wh/kg|
|Liquid H2||NASA/Sensor Technology/AeroVironment||—||—||—||AeroVironment Global Observer (GO-1); 65,000 ft alt., 7-day endurance; PL 180 kg|
Copyright © 2015 Óscar González-Espasandín et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.