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Not to mention liquid H2 has quite a bit lower energy density than liquid fossil fuels. Many rockets have used kerosene in their first stages for this reason. N
by cultus 6y ago
Not to mention liquid H2 has quite a bit lower energy density than liquid fossil fuels. Many rockets have used kerosene in their first stages for this reason. Not the end of the world for aircraft, but certainly another major disadvantage.
- funcDropShadow 6y agoBut the energy density per mass is still better than Li-ion batteries.
- nickik 6y agoLi-ion batteries are improving at a faster rate, and you can use your gravitational energy to recharge the battery.
- dmurray 6y agoHow does that work? You run your propellor in reverse like a wind turbine? This doesn't sound completely ridiculous but is there even any proof of concept for that? The gravitational potential energy doesn't seem all that high - most airplane fuel is burnt maintaining height, not gaining it - to justify the complexity of recovering some small fraction of it. Still, I once thought the same about regenerative braking in electric cars.
- 8note 6y agoHydrogen is a storage mechanism; there'd be a way to reclaim your energy either way