Control engineer. Notes on how robotics actually gets built in China.https://hitgavin.dev/https://www.wired.com/story/how-tesla-made-its-new-230-mph-car-fly/https://www.wired.com/story/how-tesla-made-its-new-230-mph-car-fly/"Flying car" is Musk's framing; an aviation expert told CNN it is closer to a hop. The mechanism is the interesting part. Tesla's Lars Moravy puts the rear thrusters at more than 80 kN — the same order as a Dassault Falcon 10X — paired with a suction system that claims 0–60 mph iFri, 16 Oct 2026 00:00:00 GMThttps://hitgavin.dev/posts/gravity-and-joint-pid/https://hitgavin.dev/posts/gravity-and-joint-pid/Posture changes the gravity torque on a humanoid shoulder by 16 N·m and the stability margin by 0.018°. Here is why that is exact rather than approximate — and the one place gravity does bite.Wed, 14 Oct 2026 00:00:00 GMThttps://hitgavin.dev/notes/https://hitgavin.dev/notes/Every post about AI-assisted coding assumes you can run the test suite in eight seconds. Mine is a forty-kilo machine in a lab down the hall, and half its failure modes only show up on an oscilloscope. The advice does not transfer, and nobody writing the advice seems to have notiWed, 14 Oct 2026 00:00:00 GMThttps://mcap.dev/https://mcap.dev/Worth reading if you are still on rosbag2's sqlite3 backend. The indexed, chunked layout means you can seek into a multi-gigabyte recording without decompressing the whole thing — which matters a lot once you are shipping compressed video topics alongside joint states.Tue, 13 Oct 2026 00:00:00 GMT