Ironically one of the areas it _is_ being used successfully is in delivery of blood to some areas in Rwanda, but they're using fixed-wing drones and are even do

Ironically one of the areas it _is_ being used successfully is in delivery of blood to some areas in Rwanda, but they're using fixed-wing drones and are even doing slingshot launches. [1] The economics are totally different, though. The "product" is very high value and has a short shelf life, so being able to deliver it quickly is a big benefit. On top of that, using a fixed-wing delivery vehicle and launching it with a human-powered slingshot makes it actually reasonably energy-efficient. [1]https://youtu.be/bnoUBfLxZz0 https://youtu.be/bnoUBfLxZz0