All has been going well since  I did Autotune earlier this week. When flying my Quad 2 days ago in High winds ;20mph, gusting to 26mph , all was going well until the last RTL. I was ABOVE RTL altitude, engaged RTL, copter started to descend, then - I think - a gust of wind hit it and it started to roll, but then the motors stopped and copter fell to ground.  Previous RTL during same flight was OK.  Running TLOG afterward show a Disarmed- Crash condition occurring at 50 feet or so, which sounds about right from what I remember. It is at @ 93% on TLOG and Line 33000 on LOG.


Flew twice yesterday and all went well, but it was only about a 9mph wind.

Could the copter have thought it was in a crash mode while still airborn and disarmed due to the wind throwing it around?  Telemetry on HUD  just lagging events, or do you see something else that occurred ( Like me doing a dumb thumb)?


I have noticed before that in a mission while ascending to altitude, that the motors really slow RPM rapidly when target altitude is reached. Almost sounds like they momentarily cut at that point before leveling out, rather than just slowly coming to a hover RPM.

X535, 3DR APM 2.5 with RC7 installed ; 3DR blue motors and 3DR non Simon K ESC. 4 cell 3300mah battery.


Hope I am not wasting anyone's tome on this ,but I am stumped as to what may have happen.



 Joe B

Views: 464


Reply to This

Replies to This Discussion

There is no function for detecting crash. There is, however, a possibility that it detected successful landing.
Wind might have fooled the barometer.
What was the logged altitude, the moment before disarming ?

Andke, Thanks for responding.

In looking again at T log in 1/10 speed I see that the Crash: Disarming message occurred after it hit as it shows a negative altitude.  The Rolling started at around 50 feet up, and CH3 output went low to high, I guess trying to compensate for the greater than 90 angel the craft was in. I can see that the craft at Tlog 93.97% was past 90 degrees in roll. I too am thinking just an unlucky wind gust, but it's been bugging me as to why the craft just seemed to shut down the motors.. I understand I just have may been too low for any corrections to kick in. Thing were happening fast!  Not sure what I was doing on the sticks in the last seconds,  but my fixed wing reflexes would undoubtedly had me cutting throttle before hitting-  I have been in RC since 1972, but only 6 months in these machines.   I just want to see if anyone else agrees it was only wind. My electronics are inside one of the RCTimer Domes, it's fairly open on the bottom plate so a gust may have hit the board and confused the barometer.  As to the "crash:disarm", This was the first I have seen that, but I think I remember seeing conversation about this as a newer feature in RC7-hense my decision to post, in case that needed attention.


Joe B.

Hello Joe, did you find the answer to your problem, did it happen again, I had similar event of motor shutting down however it was on RTL.

Daniel, No I never really did figure that one out. I was using  RC7 at the time and after the crash I went over copter carefully and found nothing obviously wrong.  I have made many more flights since then with no problems, BUT not in high wind/gusty conditions!  I am wondering if the wind caused the motors to loose sync , but it's been fine since. I was lucky and the copter landed in a small pine tree so the only crash damage was a broken prop. 

I currently I am running the 3.1.2 with no problems. I have flown Stabilize, Loiter, Alt- Hold, Circle and RTL with it with no problems.  I am not sure what happed then, but suspect that a strong wind gust caused my crash, as it seemed that all the motors stopped or slowed at that time. I was probably too low for any corrective actions at the time.  If I ever have it happens again I will be sure to let you know.


Reply to Discussion


© 2020   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service