I tested out my new copter on Saturday and the throttle was too sensitive (linear curve), so I went to land after a few seconds in the air and flipped it over. It partially landed on a buddy's copter, so everyone ran to knock it out of the way. During the commotion, the throttle stick moved slightly and a prop hit my girlfriend's hand and cut it up pretty badly. Besides her hand, I had a couple of broken props and my low voltage sensor came apart.
I got everything buttoned back up the next day, but my motors didn't start spinning in sync any more. I realized my trims were off on my tx and thought maybe I ran through the cc3d wizard with them that way the first time, so I went to run through it again.
After that, I tested and still saw the same issue. With a little throttle, two motors spun nicely, but the other two didn't even look like they were trying to move. I gave it more throttle and they all spun up and I could hover, but it drifted noticeably to the side. I backed all the way off the throttle and turned off the tx (didn't disarm though).
Then I realized I should look at the trims on the tx one more time to verify they were still zeroed. As soon as I turned on the tx, the copter went full throttle straight into my ceiling. My finger was on top of the throttle sitck, holding it all the way off, so I know I didn't accidentally give it any throttle, and I damn sure didn't give it full throttle. I'm just glad all of my FPV equipment is still sitting in a box and wasn't on the copter.
Anyway, I'm going to regroup and rebuild and try to figure out what went wrong (luckily I bought an extra frame).
I learned some very valuable lessons this weekend the hard way:
-Make a habit of disarming the second you land.
-Do ALL testing with the props off until you're sure everything is stable.
-Most importantly - multirotors are EXTREMELY dangerous and should never be thought of as a toy (except when importing them through customs into the US).
I agree 100%. I definitely learned my lesson from those incidents. It's almost good that they happened because I'm extremely over-cautious now and have developed some very thorough safety habits. I also learned to not blindly trust that the software on commercial products is free of bugs. After putting everything back together and testing with the 9x with stock firmware, I learned that when the tx was turned on, it would give half throttle for a couple of seconds. I reflashed with er9x and that problem was resolved, but I tested it thoroughly without props before I was ever able to trust it again.
HI mate you and your girlfriend are really lucky, the issue in doors was,the tx went into fail safe mode in a plane all servos bind into last position that the transmitter gave it , if it has GPS it was also trying to go home and that was its last GPS signal when is was last outside , BIG rule props off guys , i know this will sound strange but some times after a crash you need to reset everything esc throttle range too , loss of power and impact does strange thing to electronics ,also if a tiny bend in a motor shaft will make the motor tight at one point so more power needed to move the motor , so it does not spin up the same as the other do
The ntm motor you have are very powerful motors i use them as well see as you have the 450 flame wheel hk is the cheapest £9 for the frame get 2 so you have spares , also while your fixing it i would move the receiver off the arm away from the ecs , the esc has a switching bec and can make interfearance with the rx , the plastic dome that goes over the fcb , will the rx stick inside the lid so its on top of the fcb but not touching , your get a good signal there and its protected too
hope you get it fixed ok happy flying mate
I always buy spares! That's why I like the cheaper frame. I was initially teamed up with a buddy and we had the ntm motors on a QAV500. That crashed and the replacement parts were $100, so we split the rest of the parts up and I build a 450 flamewheel clone (from RC Timer). He went on to buy pancake motors and go all out on the rebuild of the QAV500. It's a nice copter.
I have since rebuilt and have gotten some good flights. I have all new FPV gear, but haven't put it on that copter yet. I just got the rest of my parts for my new build though. It's going to be a 450, but with lower kv motors and 10 inch props for some more stability. I also got a Naza M-Lite with GPS, so I'll have position lock, altitude hold, return to home, and all that good stuff. That will make me feel a bit more comfortable putting my FPV and GoPro on there. I've been very busy with work, so it might take me a couple of weeks to build it out. Once I do, I'll post pictures and hopefully videos soon. Also, it might take longer because I plan to write up a tutorial with the build.
Good advice on the RX. I didn't think of that. I'll definitely get it moved on the old 450. I can't get it on the arms on the new one with the 10 inch props, so that is good. I have landing gear with this one, so I might even be able to stick it underneath the bottom frame plate.
HI MM my 450 flame wheel had the built in pcb and i got the fcb rx and escs all inside was hard work to pack it in but can be done , thats what upset me new 666 frame i could not hide the parts inside there was just enough room for pcb , my helis are the same all wire in side frame where possible
The rx could be mounted on the back of the bottom plate so it is nearly inside
Ahh, I have maybe an hour of total flight time so far. So I understand that things go wrong but still, the damage to the ceiling dropped my jaw. I hope you left it like that, seriously... It's like a badge of honor in a way lol. Check out my post regarding my first days flying quad rotors.
Haha - I fixed it the next day. It's an old house, so it's all plaster. It was a pain in the ass to fix, but I rent the place, so I want my deposit back! The scar on my girlfriend's hand is the badge of honor. Haha. I think she said it's gone now though. It looked like there was going to be a permanent scar for at least a year afterward.