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Cake day: June 13th, 2023

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  • Going around the earth in 3 hours would require you to travel at 11 times the speed of sound, and that is without including the time it would take to accelerate or slow down.

    The concorde flew at a maximum speed of twice the speed of sound. It would take the concorde 18h30m to fly around the world if it had enough fuel to do it.

    Supersonic travel has some major issues. It takes a huge amount of energy to go that fast. Concorde could only cross the atlantic ocean, because it didn’t have enough fuel to cross the pacific. The other issue is sonic booms, which means you can’t fly supersonic over populated areas, like land.

    Maglevs have the same issue as all other high-speed overland transport, it requires expensive infrastructure to be built the entire route. The faster you want to go, the flatter, smoother and more expensive the track will be to build.

    Supersonic air is more plausible as it only requires a faster airplane. With wealth inequality, there are rich people who can afford their own supersonic plane, but an infrastructure project to build a global maglev network is far more expensive than that.






  • For context jet fuel is around 9,720 Wh/L. However, energy density(energy per volume) is less important in aviation than specific energy(energy per mass) as weight is far more likely to be the limiting factor.

    A standard lithium ion battery has 100-265 Wh/kg

    The article claims 500 Wh/kg in this new battery.

    Jet fuel has around 12,000 Wh/kg.

    Though this is a major improvement in battery tech, batteries are unlikely to ever improve to the point to even approach the energy storage of liquid fuels.

    Batteries cannot run commercial aviation as it currently exists. Battery planes will need to fly slower and shorter. There is no other way.