RTH after turning remote off went to low and hit a tree
- Thread starter Dronerman
- Start date
DJI Flight Log Viewer - PhantomHelp.com
here is is the flight-log from the incident. The battery actually fell out as it crashed so im not sure if than hinders anything
here is is the flight-log from the incident. The battery actually fell out as it crashed so im not sure if than hinders anything
You had 18% Battery left at the end of the log. No battery warnings? Or is this not the correct log??
I'm fairly certain it is the correct log. Im not 100% sure that it initiated RTH, but it definitely took off and started flying back towards the home point. The drone was disconnected from DJI go as it did this.
I have Witnessed the danger in action and there was a lot of blood- a friend was looking for tail rotor binding and when he turned off the remote the motor went to full throttle- lucky it was only a 450 size heli, the tail rotor blades made a nice mess of theee fingers
Are you sure the tx was turned off? If not, an errant stick input could have caused the accident especially if you weren't holding the controller. . As mentioned above no RTH was shown in the data. Not related probably, but of note, the flight was started with a half charged battery. Not a good practice and could lead to other issues/.
This must not be the correct log. No place does the data show an increase in altitude after landing. And just quickly without charting it, you came basically straight down from ~120ft and landed. End of data.
Then this must be the log when it landed before taking off again. Im guessing there will be no flight log since the aircraft was disconnected from DJI go app?
I believe WTB already pointed out correctly that the log would be terminated when the controller was turned off.
My suggestion to post the log was a silly one. Sorry. On the older P2V series, the log would potentially keep going, but they changed it on the P3S when they moved the FPV transceiver inside the controller.
My suggestion to post the log was a silly one. Sorry. On the older P2V series, the log would potentially keep going, but they changed it on the P3S when they moved the FPV transceiver inside the controller.
Pull the .DAT log from the Phantom itself. The data should be there. If will be in a FLY.DAT format.
As I did say - recognised RC procedure is TX (RC) on first ... off last ...
I too have had incidents of uncontrolled model ... and one was a 450 heli as well.
Your friend is very lucky because a 450 heli CAN EASILY kill - its a mean machine to have out of control. Even a 250 or a 150 can do far more damage than many people realise.
But the DJI setup such as the P3 means that the AC if powered up alone - has not initialised to enable uncontrolled action. It only can do that if all was powered up and then connection lost. That has probably saved thousands of 'idiots' from serious consequences !
Nigel
It does seem like an oversight by futaba, spectrum and others that turning off the tx might cause the rx to command full throttle. The other occasion I saw this happen was in a nitro model boat, the thing took off and ended up destroying itself.
I have a lot of respect for my 600 and 700 helis, esp when flying with CF blades- if they break pieces travel a long way and with great force.
Curiosity got the better of me today- I landed the P3 about 100 from the recorded home point and left it powered up. I let it drain down to 22% and it didn’t try and head home. Turned off the controller. It just sat there happily. Maybe they have fixed something in firmware?
I’m not going to try it with the P4...
All Heli flyers have the dance of death at times ... you spin up and instead of heli gracefully lifting, it decides to tilt and dig one blade into ground ! Then starts the horrible dance of twisted blades and holders ... with often a blade shedding and flying incredible distance.
I actually had to pull a GF 450 part blade out of the tree it stuck itself into.
Sobering experiences .....
A point to note for those who are new to the game :
Things not realised by newbies - is the more dangerous aspect of E-Motors over fuel powered.
If a prop of an E-Motor gets stalled by say a finger ... that E-Motor tries to keep going and pulls ever more power to do it. As you remove finger - it has another go at you. Allied to the fact that most E-props are thinner and more like razors.
A fuel engine will stall and stop once you get caught in it. So you only get 'bitten' once.
An E-motor does not have to primed - started etc. same as a fuel motor. On most E-RC - a simple accidental touch of throttle can have terrible results. So its common in RC to have a throttle cut function. Amazing how often that gets forgotten by even most experienced flyers !
Fuel motors of course require starting sequence and don't have that problem. Plus its audibly obvious engine is running !
I have on occasion fallen foul of not removing battery from oned model before flying another. Most Tx's as you know do not have Model Match to isolate model memory to specific model.
One incident I remember was my Cessna flown and parked. I power up T45 and BOTH move out when throttle advanced !! Lucky the Cessna hit my field box and stopped.
Another was when trying to sort a problem with one of my 450 Heli's ... I was in my large party room ... I couldn't sort so I stupidly switched model slot on the radio .......... WOW ... it took of like a screaming banshee ... hit ceiling ... bounced of TV ... whizzed past my left ear near singeing it ... and tangled itself in Wifes Xmas tree she had only setup that day ...
All the dogs and cats ran and hid when she came in and saw what had happened !! I of course paid the ultimate penalty for that one !!
Nigel
I actually had to pull a GF 450 part blade out of the tree it stuck itself into.
Sobering experiences .....
A point to note for those who are new to the game :
Things not realised by newbies - is the more dangerous aspect of E-Motors over fuel powered.
If a prop of an E-Motor gets stalled by say a finger ... that E-Motor tries to keep going and pulls ever more power to do it. As you remove finger - it has another go at you. Allied to the fact that most E-props are thinner and more like razors.
A fuel engine will stall and stop once you get caught in it. So you only get 'bitten' once.
An E-motor does not have to primed - started etc. same as a fuel motor. On most E-RC - a simple accidental touch of throttle can have terrible results. So its common in RC to have a throttle cut function. Amazing how often that gets forgotten by even most experienced flyers !
Fuel motors of course require starting sequence and don't have that problem. Plus its audibly obvious engine is running !
I have on occasion fallen foul of not removing battery from oned model before flying another. Most Tx's as you know do not have Model Match to isolate model memory to specific model.
One incident I remember was my Cessna flown and parked. I power up T45 and BOTH move out when throttle advanced !! Lucky the Cessna hit my field box and stopped.
Another was when trying to sort a problem with one of my 450 Heli's ... I was in my large party room ... I couldn't sort so I stupidly switched model slot on the radio .......... WOW ... it took of like a screaming banshee ... hit ceiling ... bounced of TV ... whizzed past my left ear near singeing it ... and tangled itself in Wifes Xmas tree she had only setup that day ...
All the dogs and cats ran and hid when she came in and saw what had happened !! I of course paid the ultimate penalty for that one !!
Nigel
RodPad
Premium Pilot
You got the .dat files by using your mobile, to tell the app, to download flight data, then you had your PC hooked to the Phantom with USB cable to the front of the Phantom not near the camera but near the logo on the front.
The files are to small, you have to share them with a dropbox, google drive, etc.
Rod
RodPad
Premium Pilot
Oh, sorry I wasn't around sooner, if the remote is off, there is not going to any data to look at, I guess we confirmed that ether remote was turned off and or the app. 
Rod
Rod
