I am creating the second version of the quad because I wasn’t happy with the performance of the first one. It was too heavy for the generated thrust. The 4 NTM 3536 motors were producing only 150% of the aircraft’s weight. That means the quad was hovering at 66% throttle which is not ok for my requirements, since I want to transport a 400g camera onboard.
My plan is to change the battery from a 3S (11.1V) to a 4S (14.8V) and change the propellers to generate more thrust. I also want to minimize the weight, so I am completely changing the frame structure. I am going again for a sandwich structure. I am using the 14mm booms for the main structure, which will be reinforced by the bottom and upper plates made of PCB. By doing this, I will also benefit from the copper paths and thus, have a distribution board for my ESCs.
The dxf files for the frame are my own design and can be downloaded for free from here under GNU license.
Vlad Petrescu 
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