Conventional wisdom tossed aside in the effort to build our off-the-shelf mega-drone, we turn now to motor mounts. I've used M8 office-furniture feet, which are delighted to be going flying instead of sitting around a cubicle. I've downloaded the spec for the U7 motor and scaled it to size by overlaying a 30mm (red) circle using Apple Pages, so as to print it and stick it to the foot-plate by way of a template. Centre punches to hand please, as the holes must be accurate; though you can drill them oversize if they don't quite align, as I know from bitter experience.
Meanwhile looking at YouTube there's a conversation going on amongst drone racers as to the benefit of 'soft mounting' methods of fixing motors with Scotch mounting tape. The reason for the ballyhoo is down to resonance, as the flight computer on a drone is sensing tilt hundreds of times per second, and adjusting motor RPMs to maintain the level. Should the airframe vibrate and flex, the motor itself might be rapidly tilted and this might fool the computer into thinking a correction is required; which may result in a self-reinforcing feedback loop which results in a loss of control.
This can be accommodated by PID tuning i.e. software response, though an easier way to dampen vibration is to use sticky-tape. PID stands for Proportional, Integrative, Derivative... which means as much to me as it does to you. Sadly aviation is beset with acronyms that people like to use in order to demonstrate their superiority in the field.
Whereas I'm just an ageing dirt-bag baby, who listens to Iron Maiden maybe.
