I'm looking for a design (parts list, assembly diagrams & instructions) for a dirt-cheap DIY quadcopter or octocopter cargo drone.
Because of the environmental conditions that it'll be facing, it's not expected to survive more than a few flights. I expect the drone to last a few weeks to a month at most.
It needs to carry a 5 kg cargo package of environmental sensors reliably from point A to point B and back under operator or software control in bad weather.
This is not a racing drone! It's fine if it flies at only 35 km/hr for 20 minutes and has a range of only 5 km.
Because the drone has a short life, the design should use the cheapest parts available.
Any tips on design, parts and assembly diagrams and instructions will be much appreciated!