@isaackuo Ukraine's adapting commercial hardware, like early Great War aircraft using rotary engines originally designed for motorcycles. A state-equivalent actor starting today and setting out to make an invader's costs unbearable isn't going to start there.
There's work going into "looks like a bird", "smallest practical flying robot", and so on. "How small and cheap can something be and have a 5% PK against human targets for a day?" isn't a quadcopter.
@graydon @dymaxion @wonka @dr2chase @cstross
How do you know it's not a quadcopter? A quadcopter is extremely simple and cheap. The monospinner is even simpler and cheaper, but it's much slower and less maneuverable.
There are a lot of cheap RC toy drones, including drones with only two props and motors. But these aren't maneuverable enough to attack a target. The quadcopter seems to be the cheapest option that's also maneuverable enough to be used as a guided weapon.