Comments by "Diana Pennepacker" (@dianapennepacker6854) on "Why A Hydrogen Plane Is A Terrible Idea" video.

What ignorant people like you don't understand is... Hydrogen has some of the poorest volumetric density, and there is no way around it. There are different battery technologies. Like Lithium Air that could have 5k kwh per kg, or aluminum Air that can have just as much yet isn't rechargeable. (Much lighter though.) Battery powered planes aren't going to be happening for a bit. Yet unlike hydrogen there is theoretical potential with batteries. When they do start taking off they will be for shorter flights, carrying less people. We will require more planes, but it is fine since electric motors are a fraction of the cost of jets. A fraction to maintain, and a fraction to operate. For intercontinental flights? Well hydrogen certainly isn't going to be doing that either due to the volumetric issue. Until we learn how to make 5k plus BAR tanks, which are also would be extremely bulky and heavy. Fossil fuels for those flights, and electric batteries for everything else.
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No it isn't a joke. It would be a joke if we tried making the same types of planes carrying similar capacities. We don't have to. We can have shorter flights, and more planes. Which still sounds bad until you realize the cost savings in fuel and maintenence would allow significantly cheaper planes, AND cheaper flights. Wait till Lithium Air, or even Aluminum Air batteries start becoming a thing. They will be able to carry 10 times more energy at least then the current generation of batteries. Aluminum Air would be like disposable batteries, but lighter. Easily recyclable. Lithium Air would be rechargeable, but heavier. Hydrogen is a joke to one reason and one reason alone... Volumetric Density. Anyway neither electric or hydrogen will ever be viable for ocean going flights. The cool thing about Air batteries is that... Well you won't have to carry the weight of the nitrogen/oxygen. It would be like a rocket versus a jet engine.
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