Arducopter issue

Posted by Damo on September 11, 2014 at 3:08pm

Hi,

i had posted an issue where my quad was not flying well. Now i got a new frame and started afresh. i have been very careful in setting it up. The quad hovers well on a new battery but then after about 2 minutes it drops altitude. yawing left drops altitude even more. i then give it full power and it still drifts down. attached is the log file. I have calibrated the esc's tried, multiple batteries. bought this new frame. from the logs i can see that the hover position is about 750, which is high. the total weight is 5 lbs (2.3 kg)

How can i solve this problem ?

2014-09-11 22-47-18.log

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –
Follow

Replies

  • Johann van de Venter September 11, 2014 at 3:24pm

    Looks like battery failsafe was triggered. 

    There seems to be a problem with you battery. See image below.

    3701827601?profile=original

    The yellow circle shows a VERY fast drop in voltage.

    As soon as you land again (green circle) the voltage recovers. 

    Looks like you Lipo pack is toast mate.

    One other thing, also have a look at the arducopter manual on how to add IMU logging. It's not enabled at present and that will help with future log analysis. 

    • Damo > Johann van de Venter September 11, 2014 at 3:57pm

      Hi, i dont have battery failsafe enabled? Also i have a low voltage alarm on board and tried two batteries with the same issue.the low voltage alarm did not alert. Both batteries fully charged. 

    • Johann van de Venter > Damo September 11, 2014 at 4:06pm

      The blue line on the graph shows the battery voltage ... There is a definite drop in voltage.

      Am I correct in saying you use a 3 cell lipo?

      Please post some screenshots of your power module setup as well as you failsafe screens in Mission Planner. 

      All I can see is the voltage drop that drops to well below "flat" state. the minimum voltage you should drain a 3 cell lipo to is 10.5 volts .. the graph clearly shows the voltage drops way below that.. 

      Charging a battery full does not mean it is not busted.. if its damaged it might charge to 100% but when used it drains very quick. How sure are you your batteries are not damaged. 

      Kind regards 

       

    • Damo > Johann van de Venter September 11, 2014 at 4:10pm

      Yes, i am using 3s. I am 100% that failsafe is disabled. I am using the 3dr  power module. I really cant explain what is going on here.

    • Johann van de Venter > Damo September 11, 2014 at 4:26pm

      Perhaps more experience people with logs can have a look but I still says it looks like that Lipo is shot.

      A craft will not stay in the air at 9.5 - 9.8 volts on a 3S pack.

       See DroneShare Analysis of your log below

      3702827773?profile=original

      What's the complete spec of all your hardware?

    • Damo > Johann van de Venter September 12, 2014 at 3:51am

      i have tried multiple lipos that are fully charged. all experience the same issue. it flies ok for about 2 minutes but needs 80% throttle and then drops slowly event though i have the throttle at 100%

This reply was deleted.