Hi all,
I know that this is a very recurrent question and I apologise for any redundancy.
I assembled recently a Tarot T960 frame, T-Motor MT3514 400 (X6), T-Motor ESC 40a (X6), emax 6 axis power board, Pixhawk, 3DR GPS module(X2), 3DR telemetry radio, RC Taranis X9E and receiver X6R.
I managed to get it airborne during first trial, but unfortunately, one of my props was not tight enough and came off in the middle of a flight. The hexa landed with the arm missing the prop, which obviously broke. It also inutilise one of the land gear arms.
After getting the spares and assembly the hexa again, it doesn't want to fly. Instead, it flips as the video shows.
Any ideas on what could be wrong?
Yes, props are all spinning correctly, motors seem to have the same speed, no weird noises, frame set to X shape, etc.
https://drive.google.com/file/d/0B_iZNL5M2cKIU2dxN0FqMHNZZ28/view?usp=sharing
Replies
To be fair, this is exactly what I've just seen the wiki tells newbie pilots to do:
http://copter.ardupilot.com/wiki/ac_tipsfornewpilots/
I'm absolutely staggered by this, it seems the absolute height of irresponsible advice. To tell newbie pilots who aren't sure what they're doing, with a copter that is behaving erractically or unpredictably to hold it while hitting the throttle.. I cannot believe this is in the wiki!
I have done this. I'd only recommend it for smaller vehicles, Arnoldo's is too big. It's a pretty good method to check if your roll pitch and yaw respond correctly in stabilize. But don't accidentally bump the throttle, or you'll probably break your vehicle and maybe cut yourself.
Oh yes I remember who you are now, you got on your high horse the last time I tried to offer some advice you didn't agree with..
So let me get this straight, someone who is clearly novice with this platform comes in with a malfunctioning/flipping *meter size* UAV with 6 *16"* carbon-fibre props, you advise them to hold it above their head and gun the throttle, and when I dare to suggest this is a bad idea (which it is), I'm a troll? Oki doki.
I have offered him reasonable advice. Whether or not it's correct, at least I'm trying..
This has helped me many times to quickly and directly obtain an answer to the problem. The recommendation has been included in the manual for many years. Previously, it has also stood "over your head".
If you have come so far that you have managed to build you own drone, managed hand saw, drill, soldering iron (and perhaps a knife and fork?) Then this is not a problem. Your life is your own responsibility. All activities in your life can potentially kill you if you do not have judgment and knowledge. Can you ride a bike?
Hi all,
Thank you for the responses. I did have one ESC connected in the wrong hub. I managed to go to the park and test it; it didn't flip, but it tends to go more to one side and when I pressed the throttle to take off, it started oscillates wildly. Is that a sign of frame imbalance? I used the APM planner but I don't know how to retrieve the data from it.
Did you actually take off? A slight tendency towards one side could be your CoG is off or it needs trimmed/calibrated - you can invoke auto trim mode by keeping your throttle stick down and to the right when arming until the led flashes red/blue:
http://copter.ardupilot.com/wiki/autotrim/
If it's oscillating wildly as/after it takes off it could be that your default PIDs are really off:
http://copter.ardupilot.com/wiki/common-tuning/
As a hint, you can assign channel 6 (the pot/knob that turns round on your RC) to rate roll/pitch in APM planner/MP. Then when you take off if it oscillates wildly you can very quickly use the knob to change your rate values, to the right will make it oscillate more wildly, to the left less wildly but too much left and it will feel 'drunk' and respond to your commands very slowly. If you get it vaguely right, good enough to keep it in a hover, then you can start an autotune and let it tune itself - usually much better than you'll achieve yourself.
sometimes, if you don't give enought throttle, It do that effect, If you can contact anyone near you with experience is the safest way, visit uk group, perhaps there is someone to help.
Esc bad plugged +1 , try to protect your copter to test the first time, I use this extra legs and do little movements to see if the multi responds correctly and them take off very low, land and remove them if all works well, others tie the multi with elastic ropes. Another possibility, check your trims they should be 0 and your level in mission planner Hud
Here is a video of the motor test. I am confused as to whether they should have the same order as the one in the pixhawk. They don' have any correlation whatsoever with the pixhawk.
https://www.dropbox.com/s/puetsic9i5htpzh/VID_20160322_234554.mp4?dl=0
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