Falling from a height of 557m and off motor output by WKM. :<

[yanher]

MY t810 fall down.
Need help to analyze the reasons why WKM shut down the motor output?



flight log file :

https://docs.google.com/file/d/0B9o3W--165qzSUdld1o3RUVVV2M/edit?usp=sharing

View attachment 13832

Video record by GH2 , last One minute without save dates into SD.

http://youtu.be/dvi378L__Rk


View attachment 13833View attachment 13834View attachment 13835View attachment 13836View attachment 13837View attachment 13838

 

[soler]

link to video does not work

 

[yanher]

video link updated.

 

[soler]

The video does not really show what happened as it stops recording before the failure, for the logs I see that your throttle went to -1,000 or zero % for 2.5 seconds before the loss of altitude.

At time 640, the throttle channel goes to -1000, at the same time the output to the motor spikes for 0.5 of a second and then all motors shut down, I suspect that there could have been a problem with your fail safe settings. Had you previously tested fail safe and loss of transmitter signal?

 

[yanher]

At time 640, FC got failsafe signal and throttle channel to -1000 , after FC shut down all motor output. then 1.6sec the signal back but motor can't restart.( I guess WKM into disarm mode) .This is point of this crash.

This is motor stop info on WKM manual.
If you choose the Immediately Mode, you SHOULD NOT pull throttle stick under 10% during
flight, because it will stop motors. If you do it accidentally, you should push the throttle stick over
10% in 5s to re-start motors

I have tested many times for failsafe setting. Wkm is ok into failsafe mode.

 

[Bartman]

you're in the US right? what were you doing at 557 meters (1830 ft)??

 

[yanher]

I'm in Taiwan. video shot for fireworks and night scene of city.
In this time I have two flight shooting. Unfortunately, crash in the second flight.:upset:
Vehicles falling in the forest. Luckily found vehicle on next day morning.

you're in the US right? what were you doing at 557 meters (1830 ft)??

 

[maxwelltub]

How much flight time do you normally get? Video cuts out at nearly ten minutes, getting to that altitude might have burned extra power. I don't know how to read the log so maybe this theory is dispelled. Also how long have you been flying?

 

[Quinton]

Not to mention the higher you go the air gets thinner and colder, so more power is also required.
What lipos you had there 2x5000 mAh, also you were carrying a GH2?

 

[hover.ch]

Do I understand it correctly, have you been at 550m above ground with a total flight time of > 9 minutes?

Speaking for my AD-8, which weights about 5.5kg fully equipped with a comparable camera (Olympus OM-D EM-5) and an AV200 and two 5800 mAh batteries, I assume that the batteries were simply exhausted. After such a climb (which, IMHO, easily burns down 1/3 of the available capacity) and a total flight time of more than 9 minutes my (2x 5.8 Ah) batteries were less than empty.

How did you monitor the batteries?
How long did you actually plan to fly?

 

[yanher]

How much flight time do you normally get? Video cuts out at nearly ten minutes, getting to that altitude might have burned extra power. I don't know how to read the log so maybe this theory is dispelled. Also how long have you been flying?

5000mah 6s * 1 for 8~9mins (older lipo) , 11mins (new lipo)
5000mah 6s * 2 for 16mins+ (older lipo) , 19mins (new lipo)

T810 hexacopter
WKM + IOSD2 + 2.4ghz ground tx
W4822 kv390 + 1555 DJI like carbin propellers
Hobbywing 30A ESC

2AXIS Brushless gimbal
Sony 520 line CCD (0 Lux for night flight)

GH2 + X14-42mm
HDMI to AV

Aomway 1000mW 5.8g TX

12V BEC for Gimbal , 5.8g TX .

 

[yanher]

5000mah 6s * 1 for 8~9mins (older lipo) , 11mins (new lipo)
5000mah 6s * 2 for 16mins+ (older lipo) , 19mins+ (new lipo)

I can watch the voltage from the LCD screen and also can check it on my DX8.
Has been repaired and tested flight yesterday.
WKM back to 5.22

View attachment 13899

Do I understand it correctly, have you been at 550m above ground with a total flight time of > 9 minutes?

Speaking for my AD-8, which weights about 5.5kg fully equipped with a comparable camera (Olympus OM-D EM-5) and an AV200 and two 5800 mAh batteries, I assume that the batteries were simply exhausted. After such a climb (which, IMHO, easily burns down 1/3 of the available capacity) and a total flight time of more than 9 minutes my (2x 5.8 Ah) batteries were less than empty.

How did you monitor the batteries?
How long did you actually plan to fly?

 

[hover.ch]

Ok, I was referring to my 5800 mAh / 4s batteries, not 6s.

However, I'm still impressed by the flight times. How heavy is the MR, incl. payload?
How do you manage to almost double the flight time with 2 batteries instead of one, my personal experience is maybe factor 1.5-1.6 at best.

 

[yanher]

You can watch origin video for 5000mah 6s *1 about 10mins as below link.
https://www.youtube.com/watch?v=OTmMtReIp8Q

my MR about 4.9kg for 1 lipo , 5.7kg for 2 lipo

use 1 lipo to fly has high line less voltage (espeically old lipo) 2 lipo for low line less voltage.
So nearly 2x in the old lipos. 1.7x in the new lipos.

Propeller types affect flight time.

in my tested, (old lipo)
1470 carbon propellers for 6mins for 1 lipo
1555 carbon propellers for 6.5mins for 1 lipo

View attachment 13952

1555 carbon propellers (DJI like) for 8mins+ for 1 lipo
View attachment 13954

Ok, I was referring to my 5800 mAh / 4s batteries, not 6s.

However, I'm still impressed by the flight times. How heavy is the MR, incl. payload?
How do you manage to almost double the flight time with 2 batteries instead of one, my personal experience is maybe factor 1.5-1.6 at best.

 

[hover.ch]

Thanks for the update.

What I wanted to say already: Your video is very impressive in terms of camera stability, did you post-process it?
Which 2-axis brushless gimbal do you use?

 

[OaxacaHeli]

5000mah 6s * 1 for 8~9mins (older lipo) , 11mins (new lipo)
5000mah 6s * 2 for 16mins+ (older lipo) , 19mins (new lipo)

T810 hexacopter
WKM + IOSD2 + 2.4ghz ground tx
W4822 kv390 + 1555 DJI like carbin propellers
Hobbywing 30A ESC

2AXIS Brushless gimbal
Sony 520 line CCD (0 Lux for night flight)

GH2 + X14-42mm
HDMI to AV

Aomway 1000mW 5.8g TX

12V BEC for Gimbal , 5.8g TX .

Yaner can you post exact model of your Sony 520 line CCD camera? a link where you order it?

thanks in advace

 

[Carapau]

Here are my thoughts:

Flying high directly above the TX can cause loss of comms due to the way radio waves spread out (of course dependent on how your antenna is pointing). Anyway this would perhaps explain why Failsafe was activated. I have come across a few people who have forgotten to set their failafes such that the throttle remains above 10% because if this doesn't happen, then the motors will turn off. So, on the bench check to see what happens to your throttle in the Assistant when you switch your TX off.