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Hi guys!! Im in serious need of some help here, and am at my wits end!! I built a new quadcopter, and cannot get it in the air!! I had it running with a KK2.1 board, but then bought a Pixhawk with gps/radio/ppm encoder kit for GPS/Autonomous flight, and thats where all my issues started!! The only things I changed other than the flight control system is one motor, and the ESC(s).... The original ESC in my 550 Carbon Bumblebee would not work with the Pixhawk, So i replaced them with a 20A HobbyWing Quattro, which solved the issue I was having. I posted a thread in ardupilot.com, but am not getting any help there, so I hope its OK if I c/p my post here.

-------c/p----

Hi guys,

well i been trying to get this thing in the air for a month on/off.... I have a Carbon 550 bumblebee that had a KK2.1 on it, but I scrapped that for a pixhawk with gps. So I get it all set up, and get it all calibrated through mission planner and try and a test hover. No go! what happens is I start to roll on the throttle, and It gets light and slowly lifts off, by the time its an inch off the ground the low voltage failsafe kicks in and it plops back to the ground! it starts off with 12.38v showing on the OSD, and by the time im at half throttle its down to 10.5v and at 9.5v the failsafe kicks in and its done. If i slwly roll on the throttle and watch the voltage, it drops every second! If i stop adding throttle at just under the halfway mark when it shows around 10.5v and let off the throttle, it will slowly climb back up to 12.+V (12.3- 12.2) what the heck is going on?? this doesnt make any sense!? Im trying using a relatively new 3s 3000MaH lipo, and two 2200 3s lipo's in parallel. It doesnt matter, they both act the same.

Im using the 3DR power module, Hobbywing quattro 20A ESC, bumblebee 930 kv motors, turnigy 9x radio, and PPM Encoder. I have a small turnigy 5v BEC soldered inline on the power module that runs the turnigy receiver. Its soldered in just after the power module circuit, but i cant see that being an issue?

I have the failsafe settings set up properly, as they are straight forward. I dunno. why is my voltage falling off so fast?? Oh. i am running the Hobbywing quattro as i received it. no programming or anything. i found posts where guys say they didnt have to do anything to them to run them.

can someone please help me?? Id really like to fly this thing sometime!

TIA< Ginnz.