Speaking at the first annual Sustainable Aviation Symposium at the Sofitel San Francisco Bay on May 6, 2016. Dr. Joseph Kallo focused on hydrogen as a more than potential fuel for future flight. He stressed that H2 fuel development was further along than one would think, and shared several examples to promote that thought. A Busy Man, a Storied Airframe Dr. Kallo is DLR (Deutsches Zentrum für Luft-und Raumfahrt – German Center for Air and SpaceTravel) Coordinator of Electrical Aviation for Germany’s equivalent of NASA, oversees work at the DLR Institute of Engineering Thermodynamics, which has worked with Pipistrel in Slovenia to convert the Green Flight Prize winning Pipistrel G4 to the hydrogen-powered HY4. He’s also Institute Director at the Institute of Energy Conversion and Storage, Ulm University. That group provides expertise on hybridization for the HY4 project. Ulm partners with aircraft designer Pipistrel, fuel cell provider Hydrogenics, and DLR to make the aircraft a reality. H2Fly will operate the …