I'm writing a proposal for a $2000 summer stipend from my university, for development on an APM UAV.
For the project, I'm looking at the X8 wing. However, I foresee a couple issues:
Most layouts I see have the (3 or 4s) batteries mounted in front, with a long cable going to the ESC in the back. This seems to be a problem because making a foot and a half cable run to carry 60+ amps DC from the battery to the motor is going to lose a lot of efficiency, and the cables would have to run very close to the ardupilot's magnetometer (compass), which is definitely going to cause problems.
So I'm looking for suggestions... I don't see an obvious way around mounting the batteries in the front, because I don't have anything else heavy to put there for balance that won't be deadweight. Does anyone else see a way around this?
I can use a 6s or higher system to get more energy transfer efficiency. My goals, however, are for efficiency and endurance, not speed and power. So, can anyone suggest a battery/esc/motor/prop combo that will provide max endurance on a 6s or higher system?
My final problem is no landing gear. I fly off a runway, so ideally I would add retracts. Is this doable?