I had two flying video platforms that were similarly equipped though different frames - one was a modified Parallax Elev-8 and the other was a Tarot 650 Sport. Both had T-Motor Navigator MN3520 400KV motors, 15.5"props and Hobbywing Platinum Pro 30A OPTO Escs. Both had APM 2.6 flight controllers. The Elev-8 fell out of the sky as I was hovering between my house and my neighbor's. It just became unstable and fell - no idea what the cause was. The Tarot crashed in a similar manner. I did notice that one or more motors did not seem to run steadily - varying pitch seemed to indicate revving. I tried calibrating the ESC's but did not solve the problem. Later, while flying a waypoint mission, it too suddenly fell out of the sky and crashed in a field - total loss. After these two accidents I decided to quit the hobby, but after several months, I wanted to try again. I would like to have a video platform but my needs are modest: Flight endurance: 20 minutes or so. Flight Modes: Autonomous waypoint missions, RTL, Stabilize, Loiter Camera will be my GoPro Hero 4 - need three axis stabilization I don't need collision avoidance as I plan to fly in open fields and will keep the aircraft in visual sight. I don't want to spend over $900 for an aircraft and would like to use parts I recovered. Here is my planned build: Tarot 650 Ironman - cheaper than the 650 Sport and a tad lighter, as it has no retractable landing skids T-Motor MN3520 motors. I have three working motors and bought one on Ebay for $37 from a hobby shop that had one and wanted to get rid of it (retails for around $100). 17 x 5.8 propellers Hobbywing Platinum Pro 30 A ESC's Tarot T3-3D three axis gimbal Holybro APM Power Module to supply power to APM 2.6 F.C. from a 6S lipo APM 2.6 flight controller with external compass/GPS 12000 mAH 6S lipo Castle Creations CC BEC 2.0 to supply power to the gimbal and video transmitter 600 mW video transmitter Based on previous experience I expect the aircraft weight sans lipo to be around 2 KG but I'm hoping to get as close to 2.0 as I can. Based on T-Motor performance specs, I am hoping for around 18 - 19 min. endurance using a 12000 mAH lipo, but I live in Colorado at 4K feet elevation, so I won't know what my max endurance is until I test it out. Any thoughts? Comments?