Voting Result: 2.30036807831
Overview for Hornet
Update 02/06/2016: Batteries used are Turnigy Graphene Professional 6S LiPo (stated in frame sheet). In packs of 16000mAh it needs 3 of them (or 2 and a smaller one for avionics and camera) in parallel to increase the capacity (autonomy) and keep the voltage in the efficient range for the cruise motor. They are swapped with the whole payload bay module, disconnecting the bullet connector first. A magnetic attaching system can be added with a few more grams so an automated unloading can be implemented.
Added items space reservation (picture).
Hornet has a Y4 configuration, with 2 main rotors very close to the CG for lifting the plane, each of them can lift 20 kg at max thrust. These 2 can control yaw and roll too. 2 small rotors inside the rear fuselage (counter rotating, with 2 independent motors and directly driven) control the pitch with enough leaver arm and help in the hover mode. To reduce the parasite drag, their hole has a cover attached with a spring, the airflow itself in hover mode opens the cover (passive system) One pusher in the back propels the UAV forward.
A modular cargo bay allows access from below. It is a bit larger than the required space and carries the batteries too for easy swap.
The landing gear has no wheels but they can be added if the client plans on operating in prepared runways.
A complete brief from a similar design (Mercury) is attached. They share several design points.