Eric Walker placed DLR HY4 under Hydrogen as fuel

Eric Walker added Hydrogen-powered passenger plane completes maiden flight to Aviation and aeronautics and Hydrogen as fuel

Eric Walker added Hydrogen-powered passenger plane completes maiden flight to Hydrogen as fuel, and added Hydrogen as fuel to Hydrogen

Eric Walker added a number of topics and Kawasaki Heavy builds world’s first tanker for liquid hydrogen : The Asahi Shimbun and Oumuamua: Neither Comet nor Asteroid, but a Cosmic Iceberg - The New York Times to Hydrogen, and added Hydrogen to Chemical elements