Today, my quadrotor was crashed.
During the flight, all propellers were stopped suddenly, it goes to ground immediately.
I'm guessing few reasons, but I'm not confident.
The copter configuration was
1. 'X' configuration
2. 25C, 2200mAh 3s battery.
3. Four ESC has BEC functionality, but I only use one ESC's BEC. So 5v was from ESC.
And battery was 12v when I checked on ground after crash.
So my guessing is that ESC suddenly draws large current, so voltage is dropped, then Ardupilot board were rebooted. This is my thought.
So, if anyone have some guessing, comment please. It'd be really helpful to develop my copter.
Mine (A Hexa) is EXACTLY this on monday. Tracked the problem down to a bad connection in the cheap chinese deans that came pre-soldered from the factory.
new blades, and a decent deans connector fixed it!
Solo, looks like XT60 Connectors are going to be the way forward....
Same thing happened to me, twice. The reason was aggressive flying, pulling stick to zero throttle and full left yaw, causing disarming of the controller in mid air. Very frustrating watching the thing fall from the sky, trying to arm it before it hits the ground.. :-)
Set dual rates on rudder, so that you have 100% and 90% rudder. When flying switch to 90% rudder so that you cannot disarm motors. Granted, you'll have slightly less rudder control but I think that's a small price to pay for not crashing due to disarmed motors. Furthermore you might be able to compensate for the 90% rudder by increasing yaw P value.
Thanks. I've been thinking about doing it this way too, I was just too lazy to set it up.
Both times this happened, the quadcopter actually starts autorotating on the way down, causing minimum damage. Very surprising because the height was about 150feet+. After falling 50 feet or so, the propellers start to spin from the air flow and the quad levels by itself. Sounds like this ....ssssshhhhhwoooooeeeeiiiiiBUMP. With a lot of "NO! NO! NO!" from me at the ground. Fascinating sport! :-)
I read this whole thread just to see if autorotation was mentioned.
I love since quads are fixed pitched collective they auto-autorotate. I hypothosise that at a certian altitude the quad can be turned completely off a make a free fall to a soft "normal" landing.
I just haven't had too many volunteers for testing.
Yes, it works. But on a helicopter you would change the pitch of the blade just before hitting the ground, to slow down further. On a fixed pitch quad this is not possible, so the speed is still high on impact. I bent a couple of arms and broke a landing leg both times, but it was up and running again after 15minutes. The prop size is probably also important. I use 11x4.7, smalle props will probably mean more speed.
have you check your remote?
in my JR when fail safe active, same time trotle is loss.
so, now i set my all chanel to hold mode in failsafe setting.
hope can help your problem
You really should think about setting throttle to a little less than hover, so your quad makes a slow decent instead of flying away.
That's possible. Thanks!
Jason, this gives me an idea. On the AVR chips it is possible to detect the cause of a reboot condition.
Would it be possible to implement a fast reboot, checking for the brownout detector reboot flag ?
I just had the same thing happen on mine too, still unsure of reason. Broke three legs (custom units), probably from around 100ft.
modified Quad kit, with 5000mAh battery, 10x45 props, 2.0.38 firmware,
Sounds like a brown out. Just Curious, but does the Arducopter power distribution board utilize all of the BECs' from the ESCs', or does it just use one? I have been making my own PDB for my multirotors with a customized PCB board. I have been plugging my servo connectors from the ESCs' directly to the APM. Since using this method I haven't had any brownouts like I was having in the beginning. My APM gets anywhere from 8-12 amps if it needs it.