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View Diary: Recent DOE Break-Through with Hydrogen Fuel Cells, should make them Affordable (275 comments)

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  •  Yes , someone does , (5+ / 0-)

    http://www.defensenews.com/...

    Liquid hydrogen was the fuel of choice because it "has three times the density of other fuels," Gitlin said. That means a pound of hydrogen will fly the plane three times as long as a pound of ordinary aviation fuel.

    But until now, at least, storing liquid hydrogen has been a major obstacle. It has required heavy, insulated tanks that would seem incompatible with a lightweight, long-endurance UAV.

    AeroVironment, Monrovia, Calif., says it has solved that problem, but won't reveal much about it.

    "We've developed a pretty innovative way to address the heavy tank problem. Strength [of the tank] is not so much the issue," Gitlin said and would say no more.

    but they are not talking  , afaik .

    http://www.avinc.com/...

    Global Observer

    http://www.avinc.com/...

    Global Observer, AeroVironment’s Extreme Endurance Unmanned Aircraft System, Achieves Historic First

    "Drop the name-calling." Meteor Blades 2/4/11

    by indycam on Sun Apr 24, 2011 at 08:58:54 AM PDT

    [ Parent ]

    •  I Knew it (0+ / 0-)

      Thanks indycam.  

      "Drop the name-calling"  -- that's good advice.  It's like MB is having to scold his unruly children.  He's a good Dad

    •  I don't know if hydrogen is "so" dense. (0+ / 0-)

      Seeing that there is more hydrogen in a gallon of oil than there is in a gallon of hydrogen, go figure. It's all in the way hydrogen clings to carbon molecules- more compact... maybe by weight, but not by volume.

      "WAR IS PEACE FREEDOM IS SLAVERY FOX NEWS IS JOURNALISM"

      by FakeNews on Sun Apr 24, 2011 at 03:48:59 PM PDT

      [ Parent ]

      •  More BTUs per pound (0+ / 0-)

        Diesel 18,111 BTU/lb
        Liquid hydrogen 51,500 BTU/lb

        "Drop the name-calling." Meteor Blades 2/4/11

        by indycam on Sun Apr 24, 2011 at 06:24:22 PM PDT

        [ Parent ]

        •  Thanks. 3:1 ration for weight (1+ / 0-)
          Recommended by:
          Sneelock

          Volume-wise though - how much larger would a jet's tanks have to be to hold the same amount of BTU's? I think I had heard the same ratio 3:1 for hydrogen vs. diesel. Too bad there are not naturally occurring deposits of hydrogen - it all has to be manufactured. The other bad news is that hydrogen atom is so small that even the best holding tanks would loose 1 - 2 % per day through any material surrounding it.

          OK, later. FN

          "WAR IS PEACE FREEDOM IS SLAVERY FOX NEWS IS JOURNALISM"

          by FakeNews on Mon Apr 25, 2011 at 04:33:40 AM PDT

          [ Parent ]

          •  The airplane above is not a jet . (1+ / 0-)
            Recommended by:
            Sneelock
            The other bad news is that hydrogen atom is so small that even the best holding tanks would loose 1 - 2 % per day through any material surrounding it.
            The bad news is that its hard to keep it from boiling off .

            "Drop the name-calling." Meteor Blades 2/4/11

            by indycam on Mon Apr 25, 2011 at 03:52:12 PM PDT

            [ Parent ]

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