• Oct 7, 2022

    Why is Optimus humanoid?

    Few days ago TESLA introduced their humanoid robot, Optimus. One question of the many raised by this announcement is why a humanoid bot? The answer could be: in order to be able to learn by observing.

  • Jul 1, 2021

    On drones, helicopters and Blackbird

    In a previouis post I discussed the physics of hovering drones and helicopters. My interest in the physics of propellers was reignited by video discussing the possibility of a wind-powered vehicle to move faster than the wind (in the downwind direction).

  • Nov 22, 2020

    On drones and helicopters

    After playing a bit with a DJI Mavic Air drone I started to wonder what are the differences between the physics of drones and helicopters. One particular question is which one would be better to hover with given weight. Also how long can a drone and/or helicopter fly (hover)?

  • Nov 9, 2020

    A library of 3D models

    Some time ago I got access to a 3D printer. After learning to use the Blender software I put together several decorative 3D models. Some are even printed.

    Tiles for a (imperfect) Penrose tiling