Am often asked why not replace the spiral square centre-stage with an arrangement with parallel prongs like an 'H' and truth is, you could; though there are any number of reasons for being happy with your lot.
First and foremost, with its arms spiralling away like a galaxy, this baby looks like it belongs to the heavens.
Secondly it means all the components to which it attaches and of which it comprises are identical, reducing both part-count and ease of assembly.
Thirdly it spreads the load-paths more evenly, to the extent I can stand on this and it barely flexes whereas I am sure that with any other geometry it would inevitably sag.
Fourthly and as pictured here, it more nearly centres the centre-of-gravity.
The latter reduces the 'polar moments of inertia' that incline road and air vehicles to spin... class-action against Porsche anyone? What it does however for multicopters with their four axes of lift is to spread payloads more evenly, which in turn means that all propellers rotate at the same RPM given all else being equal.
There is though a feature here that represents the way personal air vehicles depart from conventional drones, in that battery-packs often address ESCs and their motors individually (as seen prominently at https://www.liftaircraft.com). From our point of view it dispenses with power distribution and the messy soldering that goes with it, and reduces both power losses and the chances of short-circuits at the same time.
It does mean ancillaries like the RC receiver or FCC need a separate power supply, but that's something I'll not be losing sleep over. Ideally I would like the assembly at each corner ~ ESC, motor and prop ~ to be swapped out as easily as a racing wheel-change.
(There are several outfits round the world arranging for 'Wacky Races' for these things, and we shall be throwing the TELEDRONE hat into the ring, incidentally.)
Note too that the avionics are pitched beneath the pilot seat, as in airliners. Maybe all those hours I spent there were not wasted after all?
