Finally my first post. I have been carefully trying to absorb all the information i could from this forum for the past three weeks, since i completed my first quad-copter build.
My set up is as follows
3s Lipo 25c 3600 maH battery - (http://ip-battery.weebly.com/hobby-plane-batteries.html )
Racestar 930KV motors
Gemfan 10x4.5 props
Pixhawk flight controller - (PX4 2.4.8 Flight Controller NEO-M8N GPS Radio Telemetry OSD 3DR 433Mhz)
Diatone Q450 Quad 450 V3 PCB - frame
3 X 30A SimonK ESC Multirotor X525
1 X XXD HW30A 30A Brushless Motor ESC - this is on the rear right motor n0.4
My AUW is 1.32 KG
Earlier on today I went for a little spin that ended up in disaster and my quad copter in the neighbors yard. After taking off on stabilize and engaging ALTH mode, i cimed up about 10 meters or so and started doing a small tour LOS around the neighborhood.
2 min later, it just seems as though the quad dropped out of the sky, but not all at once. Like a slow controlled drop - at which point i applied maximum throttle to regain lift. It just seems like the quad copter was not able to stay in the air or lift itself up.
Its done this on several occasions in the past but i was low flying. Especially when i am in altitude hold mode, sometimes the quad loses altitude as if the battery is low and it would come all the way and touch down before climbing up again with my throttle on maximum. I suspected the batteried at first, but i have 3 batteries that i am running, 2 X 3600mah and 1x6000mah. same effect. I thought maybe the voltage was dipping but i cannot see it on the ogs. if i take off immediately again, the quad-copter easily lifts off and will fly another 3 minutes before the 25% capacity alarm goes off.
I am lost for Ideas. I checked my batteries after the flight, My battery was still above 11v and the capacity at 90% - from a full charge with two minutes of flying mostly climbing. Not bad I think?
Am i wrong all together ? Have I messed up on the build? should I be running a 4s setup?
My logs seem to be too big to upload, so i have uploaded them to dropbox and here is a link.
I have scoured through the logs and cannot figure out what went wrong. Can someone please help. I am completely new to arducopter.