AG0N-Gary
Second Officer
Flight distance : 700846 ft
United States
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Rnfaust Posted at 2017-7-3 06:51
Yes Bud Walker is pretty amazing. He analyzed a runaway I had over a year ago. All ended well when I switched to ATTI temporarily. That seemed to be a possible compass related anomaly. I was testing controls and yawing at full stick (360x2). He said probably not a good idea.
I did have 2 relatively hard landings 2 years ago, but no broken parts. It's been very reliable overall.
Is there one ESC module? I see good size chips at each motor.
Rnfaust:
I found your post interesting, because I'm in a similar boat. I'd been flying my P3A for almost 2 years before it was "destroyed" in an amazing, and amazingly fast, crash from low altitude. To say I was surprised is an understatement.
I had recently received my new Mavic and decided I wasn't going to actually fly it until weather improved enough and my wife had time to give me a hand with what I had in mind. I wanted to put the P3 in the air and video the maiden flight of the Mavic for a simple launch, hover, etc. Prior to lighting the fuse on the Mavic, I decided to do a quick checkout of the P3, so I lit the fuse on it, let it idle a bit while checking various things on the screen and then lifting off. I put it into a hover at about 5 feet at first and checked for stability. Everything looking good, I rose up to about 15-20 feet and hovered. I rotated both directions, slid left, slid right, back to a hover. I then gave it about half throttle (climb) simultaneously with either forward or right lateral (don't remember which) movement for a climbing angled departure. I was watching it the whole time, and it was still only about 20 feet in front of me. Within one to two seconds, it rose up on one side and continued the arc until it was on edge and went completely out of control. It headed in my direction, it turned out, and powered itself into the concrete it had launched from just a few feet away from me. The sound was sickening, full power, crash, and nothing. While recovering my jaw from the ground, I looked down beside me and started spotting pieces. The battery had been ejected immediately, so it had shut down and not trying to burn itself up. The battery seemed fine.
Looking at what was left, it apparently hit with one arm either straight down, or slightly angled and inverted, stressing the upper half of the arm until it peeled itself open and tweaked the tip of the arm. There was one prop destroyed at impact with various pieces found at the location. There was one other slightly damaged prop and the others were fine. The camera and gimbal seemed fine, and were even level when started later. All motors appear to be fine, with nice smooth rotation and not ugly sounds. They seem to be fine.
Later, I put a battery back in it and started it up. Camera seemed to initialize and gimbal was level (or at least as level as it usually is). Motors spun up just fine with no props and all sounded the same. I couldn't put props on due to the shell damage, which I hadn't worked on yet.
I later launched the Mavic and did my initial flight, sans video from the other platform.
I have looked at the log and noticed a mention of compass error or something similar just as it crashed, but that's as far as I've gone. Takeoff was from the exact spot in my driveway where I have launched for 90% of my flights over the last couple of years I've had it. It was a month or more ago that I looked at them so might not remember all of the details at this point. The whole thing is sitting on my desk while I tend to other more pressing tasks.
What am I going to do with it? Well, if the control system really is stable enough to fly again without visiting the drone hospital, I'm going to put another shell on it and rebuild it. In fact, I think I'm going to replace the stock shell with the Phavmic shell. If it is more seriously damaged, I'll have to evaluate it before deciding to either sell for parts, send it for repair (probably not dJI), or put it in long term storage.
That's my story. I'll be interested in keeping up with this thread to see how you come out.
Gary - AG0N
Crashed in Nebraska |
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