A University of Baja California (Oceanographic Research Institute) required us (mRo) to develop a fix-wing UAV. It had to be small/portable and capable of carrying a multispectral camera that would be used for oceanography research. The camera would be a Parrot Sequoia and of course… it had to be very cheap due to budgetary constraints.
It is well known that 90% of hardware production/quality issues are related to pasting performance. For those unfamiliar with the topic, pasting is the process of adding a special “solder paste,” basically a mix of tiny micrometer-size metal balls and flux, which can be applied on the PCB using a “stenciling” method.