
Airbare
14.9K posts

Airbare
@Airbare40
no party or religious affiliation. father to one son and one angel. climate - economics - justice






It’s sounds harsh but reality is we sacrifice people on US urban streets every day because asking a fire department to drive a slightly shorter truck is simply a bridge too far. Unsafe street design kills more people than fires. By a lot.





@criticalurban How is this efficient?








New curb protected bike lane on Adams Blvd between Fairfax and Washington.











You cannot buy a new gas turbine until 2030. Order books at GE, Siemens, and Mitsubishi stretch to 2029. Turbine prices have nearly tripled since 2019. Every AI data center needs power and every gas plant needs a turbine. And every turbine has one part that bottlenecks the entire industry: The blade. It has to survive in gas 500°C above the melting point of the metal it's made from and spin at up to 20,000 RPM under 10,000 g of centrifugal force. Each blade is grown as a single crystal of nickel superalloy, pulled through a vacuum furnace at 3 mm per minute. A set of blades costs $600,000 and takes 90 weeks to grow. The same metallurgy powers modern jet engines. Only 3 companies on Earth can build one. China spent $42 billion trying to catch up. They bought a Russian fighter engine, took it apart, and copied every part. Their copy ran 30 hours between overhauls versus 400 for the original. Modern Western engines run 4,000. You can reverse engineer the shape of a turbine blade. You cannot reverse engineer 60 years of metallurgy.
















