I have a request to build a copter which can handle 8Kg extra payload for a flight duration of 40 minutes.
The project is for the Local Search & Rescue Team to find the missing and lost people in the snow and mountains. The payload will be 2 ways radios, Blanket, Water, Food....until they reach them by car.
Your help is very important for us.
I found 3 frames which can be helpful but I want to know if it has been tested by someone:
Steadidrone: the SteadiDrone X Airframe
and FoxtechFpv, Foxtech Devourer130 Folding Qudacopter http://www.foxtechfpv.com/foxtech-devourer130-folding-qudacopter-p-1614.html
and the Kraken Foxtech K130 V3 Folding Octocopter http://www.foxtechfpv.com/foxtech-k130-v3-folding-octocopter-p-1693.html
As for the motors, I saw that the U8 is a good one and used by both companies.
I would like to have your help if you have any experience with that, or have other ideas.