I’ve had the weirdest experience yesterday with an 18 inch props quad. hopefully nobody was harmed as the quad was in the ground. the power module simply bursted into flames. this happened while I was performing a 3d calibration. as soon as the battery was disconnected. I opened up the quad, the electrics are fine, pdb is intact, battery is also fine. I am at loss trying to identify the cause of the problem.
I flew the aircraft many times in the past month. roughly 3 hours of flight in totally before this happened.
Anyone experienced this before ? I have attached a picture of the power module. clearly fire start from there.
any help is appreciated. thank you