Maiden Crash

I built my my hexa very slowly after getting a bummed esc. So it gave me lots of time to read all the start up threads including the crash ones.

I thought I was thorough going through everything methodically, double, triple checking stuff.

Did hand test...other than losing some blood (pic) on a prop during one, it seemed ok. The thing that did make we wonder was during slight tilting, it seemed to want to stabilize but extreme tilting would make it pull hard the tilted way. I just chalked it up to needed to do that for recovery...However it did make me check and recheck before first flight. 

So first attempt, it started to lift off but looked a bit wobbly...so I shut down and read some more...coming across a thread where a hexa wobbled but they just advised to get it off the ground and let it stabilize. Well I did and it went sideways, oscillating into a crash. Just two props and a broken arm...I guess that's not too bad.

I'm going to pull everything apart and start from scratch again cause I'm scratching my head. 

Could it have anything to do with rc set up? Calibration was all ok and in limits.

Thanks

Trent

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  • Successful flights!!! Apm the problem

    After contacting 3d robotics their only offer was for me to send my apm to them and if they deemed it product faulty then they would either try to fix and send back or send a new unit if they couldn't. Well waiting for parts has been hard enough trying to get this project off the ground for a month and a half...so I decided to order an apm from Canada drones and just swap the new one in before sending min to 3dr.
    Loaded firmware and without any other changes I was off and flying. Not perfect as there were a few surges in rpm speeds once in awhile but I can at least join the discussion now.

    On the rant side of things...it is not always builder or pilot error. I was convinced by all the threads and advice on here that I must have done something wrong. It cost me a lot of time and parts. I know I should have caught it in the cli motors test but I didn't.

    On the praise side of things...man these couple flights were fun and and I'm very much looking forward to continuing on with this project!
  • Well I narrowed it down to the APM. I ran cli motors test with esc's plugged directly into the outputs. No matter what motors are plugged in, 1 and 2 fire together.
    I don't know where the short is in it but it's nothing I can see.
    Very expensive, long way of finding out it was the apm
  • I'm pretty sure I'm on the right software...

    Cli motor test...motor 1 (and 2) fire then short pause...motor 4 fires then short pause...motor 2 (and 1) fire then short pause...motor 3 fires then long pause. So it looks like it is running the quad test. 

  • Ok...found something
    When running the cli motor test I realized this time that every time motor 1 would fire, motor 2 would as well and the same when motor 2 would fire, motor 1 would also.
    I am going over my apm as my hexa was also flipping.
    Can't find anything obvious like a solder. Anyone else run into this?
    I did solder the jp1's together but I don't think that should affect??
  • OK....this is getting crazy!

    Because of a terrible start to this I decided to order quad center plates, 850's, and 10x47's to make things easier.

    Built the quad...Went through step by step...and the thing still wants to flip over on take off. I do not know what to do. The only thing I haven't changed is the APM and GPS.

    The Calibration of the radio seems normal and within spec.

    Please help me!!!!!

    P.s - flipped over lightly but ended up in sand and the motors are gritty. Can I just open and clean?

  • 3 flights...3 crashes!!!
    Turned down stabilize gains...then went for my third flight.
    Throttled up slowly but still climbed very fast. Stabilize was much less drastic but still had a slight wobble. Problem was I could not stop it from climbing. Although slowly I couldn't get it to stop without cutting motors.
    I hit alt hold and it continued to climb slowly to approx 60 meters...switched to loiter and all my motors stopped and it began to fall, then it started and stopped again and ended upside down.
    Switched to stabilize and motors were running but fast into ground.
    All props, assembly stack, and two motors all busted!!! I'm going to need to win the lottery to play this game.
    Help again please
  • Ok...after now crashing again on my second flight this is getting frustrating.
    After first crash I decided to sit down and start again from the power board out.
    Reconnected all the esc's, apm, and receiver. Reconfiged the esc's, motor directions, and reassembled the props. Recallibrated the radio, flight modes and sensor tests. Hand tested and it seemed as though everything was working.
    Lifted off for test flight...hexa climbed quit rapidly to 30 meters with little throttle movement (may be radio adjustment, I don't know), looked as though I was going to be able to fly when it quickly started flying back and forth wildly trying to stabilize without radio input. When it started to go one direction to far I panicked and hit loiter mode. That's when things got worse...it started an aerobatics show on its own for awhile then flipped upside down and headed for the ground at full speed!
    In the last 15 ft it for some reason flipped right side up and at least hit the ground feet first walking away with only a broken leg and one prop.

    Help!!! Please!!
  • 3D Robotics

    We're going to need more info. What hexa kit did you use? Did you check the motor order/prop directions first (CLI/Motors)? Did you test it by hand before flying? Etc...

  • Did you follow the "First Flight" section in the Wiki - particularly the control responses?

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