"No ones successfully used this gimbal?"

"So, think this will be my final update on this topic.  Thanks everyone who chipped in with advice or ideas.  This morning I attempted to get the ESC's calibrated and the pixhawk continued to restart over and over, making all sorts of dying robot…"

"New development...I thought it was interesting that the pixhawk would reach a certain point before going haywire and decided to try swapping out the micro SD card.

Well, so far that seems to have worked! I didn't have enough time to fully test it…"

"http://youtu.be/45XR-rtI-NA A video of the startup issues... This happens whether I power it with the power module, USB, or the servo rail as shown in the video. Doesn't sound good does it? Sometimes it doesn't get past the yellow blinking light.…"

"Some really good advice here, I'm gonna try all this in the morning and I'll let you guys know how it goes. Thank you."

"Thanks Hugues, I wasn't sure if calibrating the ESC through pixhawk was the reason they wouldn't spin up when everything seemed to be armed.  I can successfully calibrate through my RC ch3.  The ESCs are just beeping as if no RC is connected when I…"

"Yeah, I've tried pressing it after the tones stop and also immediately on power up.  The safety switch will go solid, but the esc just keeps beeping and throttle does nothing, nor does the esc sound like its calibrating."

"@mike yeah I re flashed the pixhawk to quadcopter from plane.

Setup is as follows:
1. Took just the pixhawk, nothing plugged in, and re flashed to quadcopter setup from arduplane. Successful.

2. Installed pixhawk in the copter and hooked up the…"

"I have been using the safety switch. I hold it down until it's solid. I've alsotried starting and quickly pressing the safety switch like another user recommended."