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Cake day: June 13th, 2023

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  • The carbon comes from the fuel. Burning a ton of jet fuel will release the same amount of carbon regardless of the plane that burns it.

    Taylor Swift’s plane is a Dassault Falcon 7X. It weighs around 17 tons and seats 12 to 16 passengers.

    Her plane burns 60% less fuel than a 737 MAX 8. However, her plane holds 9% of the passengers of the MAX 8, so its far less efficient per passenger than typical commercial aircraft.

    Private planes are not a huge contributor to carbon emissions in comparison to others. They’re bad, obviously. But there are far more commercial airplanes, and they fly much more frequently than private jets.

    Private jets get people’s attention. One person being directly responsible for that much carbon is notable is unconscionable. But it’s the scale of transportation overall that is the issue.





  • 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.





  • The issue is not that the parts aren’t titanium, its that there isn’t a paper trail documenting the titanium.

    This is an issue, because improperly forged titanium can have issues that makes it unsuitably weak for its intended purpose. Having documentation showing where the materials came from, when it was inspected for defects and when it was manufactured is critical for safety.

    United flight 232 had an engine explode in part due to defective titanium. This is a real safety concern.

    Though the headline says boeing, the article mentions these undocumented parts being found in airbus planes as well. Its an industry problem, not a Boeing specific one.