Hi.
After flying my Y6 for a while i wanted to test RTL fail safe so I tuned of my transmitter. The drone flow over the landing site and then on 60 meters height turned of all engines and dropped from the sky. Now I'm trying to find out if its possible to by landing gears from 3D-robotics. :)
In the log it seems like the Pixhawk decided to change Dalt to zero suddenly. I also have an Err Failsafe_radio-1.
Anyone that has some idea what went wrong?
I also attach the log: 2014-08-24%2016-27-59.log
Thank You in advance
/Niklas
Replies
It´s strange behavior indeed!
Did You know, by the way, that 3DRobotics does not sell landing gears as separate units. There is a repair kit but that has only two complete landing gears and a lot of things I don't need, the cost is 115 usd. I ordered a new frame instead for 65 usd.
Maybe I'm the only one who destroy the landing gears?
Your landing speed is set way too high. It thinks it's at home and on the ground, so shuts down. Land speed should be about 50 cm/s.
Actually I had done that mistake once Bill, and hopefully learnt something. In that case I had set the landing speed to 30 m/s instead of intended 30 cm/s. But as it only hovered on 10 m and the grass was thick the drone survived.
This time I'm quite sure I set it to 50 cm/s. Or can You see something else in the log?
@Niklas
The value you have set is 5057 cm/s I think maybe when you typed something in you didn't overwrite. It should be about 50 cm/s.
Look in the parameter list for LAND_SPD (or something like that, I forgot)
Ah... You are right. I will try again with a better setting. Do You believe this is the reason? I had the impression that the engines was cut of completely, but of course it did probably not reach 50 m/s. is it possible to actually set such a speed as landing speed?
yes, apparently it's possible. :)
There is not much sanitychecking onboard, maybe mostly because people wish for APM still to work, and the space is limited.
on the other hand, some settings are impossible to predict sane values for, like PIDs , and fence areas and actually desired vs configured failsafes.
OK. I think we can safely close this discussion now. Apparently I manage to do the same error twice. Thank you for your helping me find the error.
Im expecting spare parts in the end of this week which is quit impressive as I live in Sweden and ordered the gear yesterday. :)
Best regards
/Niklas
I have found an error in MP 1.3.9.
If you select something like 40 cm/s in the gauge standard params and write to pixhawk. Then refresh params the setting changes to 100 times more. It's repetable.
If I instead use "full parameter list" and write the settings it works rather well.
Does anyone seen this apart from me? Can You repeat and check if the problem is "global"?
/Niklas
My drone crashed when I initiate RTL and dont now why it happend.
I'm new to this all and was hoping someone could tell me what I have done wrong.
I started a threat here:
Crashed when initiate RTL (Return to Launch)
Wil someone please take a look and help me?
that's a good catch Bill !
except does not "think it's landed" or "shuts down" - but puts motors at idle (which we could see except for no RCOUT logged) to achieve the incredible vertical speed of 50m/s - and crashes.
The actual land detection requires the altitude to stop changing.
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