• 3 Posts
  • 340 Comments
Joined 1 year ago
cake
Cake day: June 16th, 2023

help-circle




  • I stopped reading the article there.

    Either the author is voluntarily misleading or he has no idea of what he is talking about.

    Here is the map all the fast charging stations (>100kW) along the way between Paris and the Mont St Michel.

    The Tesla model 3 in Europe uses the standard combo CCS plug so it can use all of these stations.

    https://files.catbox.moe/8v8j4l.png

    I did not count them but at a first glance the number of charger is higher than “none”

    Edit: OK I read the article after all but I really don’t see what problem battery swapping would solve.

    I could see a use case for public transport that has to go a specific road and need to run non stop every days but even then I suspect that having overhead cable on a short section to charge the battery while running would be more appropriate than battery swapping.

    The article is talking about the lack of charging station but battery swapping just make the problem way way worse. A battery charger is just a parking spot and a high voltage AC - DC transformer connected to the grid. It’s relatively cheap and easy to install, does not take much space and work for all electric cars compared to a battery swapping station that can only work for one specific brand (specific model too ?) need robotics and plenty of storage. Its much harder and expensive to install and you need one charging station per brand. This means less stations overall.

    Finally there is the speed of charging, this is true that battery swapping is probably faster than fast charging but honestly I don’t find charging an electric car that inconvenient.

    On long highway trips I need to stop around 20 minutes every 2 hours, a 20 minutes break every 2 hours is not that bad, just enough time for a toilet break, a quick coffee before going back on the road.






  • I can guarantee if the story is true or not but my father talked regularly about a neighbor that he knew when he was a kid.

    The neighbor was a ballet dancer above 2m tall and was driving an old school mini.

    To be able to fit in it he removed the front seat and was driving sitting in the back seat.








  • Destructive testing has always been part of every engineering development projects.

    When developing new parts it’s common to make a lot of test parts and stress them to failure to see how they react.

    For innovative design it can take several iterations before finding the right material/design. Each destructive testing is bringing valuable information.

    Knowing exactly how a part will fail gives extremely valuable information on how to build a part that will NOT fail and everyone does that including NASA.

    SpaceX has just brought this philosophy to whole different level by doing destructive testing on the whole rocket. The best example is that on the last flight they purposefully removed heatshields on some area of the Starship and added sensors in the area to see how it would impact the ship.

    The can afford to do that because they focused on building a rocket factory to mass produce starships rather than building a rocket. It means that even if they were not launching it the factory would still produce Starships.

    PS: SLS is not 10x the cost of Starship. According to an independent report ( source ) Right now the estimated cost of a Starship launch is estimated around $90 million, one the program is operational the cost of a Starship launch is estimated to be around $10 millions.

    A SLS launch is estimated to be around $4.1 billion

    So a Starship launch is 40 to 400 time cheaper than a SLS launch