According to the Mission Planner logs, the outputs of motors 3 and 4 are double that of motors 1 and 2. Consequently, motors 3 and 4 quickly overheat.
I'm trying to get my new multi dialed-in but after only 5 minutes of hover attempts [at about 45% throttle] both of my CW-rotating motors (3 & 4) get so hot you can't touch them, while the CCW motors remain cool. All calibrations have been re re re re re-run. ESCs, radio, accelerometers, compass, and everything appears to be balanced — fore-aft CG, props, etc. — yaw seems stable, I even disassembled the motors, balanced the bells, lubricated the shafts and bearings with EPIC oil for electrics (note that these motors are new and have less than 15 minutes run time on them).
To make matters worse, This is only the third real attempt to get a stable hover but I can't quite get there from here. I still require manual trim input on the Tx of about 5% right roll and 5% up pitch for it to behave as well as it does in the video. I'd love for it to be rock steady but I'm not sure know how to get there and with two overheating motors there's no way I'm going to attempt to fly outdoors.
I have an email in to HK tech support but no reply yet.
If anyone is interested the video is here and sample log files are here:
For safety, the skids are covered in foam pipe insulation and a prop protector stick was added to each arm (the sticks are from 2 carbon fiber arrows -- $3.50 each at Walmart).
And yes, the props are right-side up =)
Frame: Tarot Iron Man 650
Props: APC 12x4.5
Motors: NTM Prop Drive 28-30S 800KV
ESCs: Turnigy Plush 40A
Battery: Turnigy 40C 5A 4S
Flight controller: APM 2.6 w/uBlox GPS
Receiver: FrSky D8R-II PLUS (modified antennas)
Transmitter: ER9X with FrSky ACCST 8CH module
Weight as shown: 2.4kg
My current PID settings: