i have the problem that the copter flips randomly during lift off. when i start the copter in hand 1,3 m above ground it flys perfect.
here the video and the log files with my flip problem
weight 1,3 kg inkluding GoPro and Battery
Software 2.5.3 with default PID
diameter Motor to Motor 53 cm
Are you taking off from grass? I've had legs caught by the grass before and it can cause a flip.
yes i did all take off´s in the grass. i will test this afternoon some where else.
i tryed this morning on the street i works much better but still trys to flip.
on the street it is much easyer to compensate the flip. for me it is now clear why the copter intents to flip in the grass. during take off my copter is sliding over the street in the grass it would not be possible.
but there is still a intention to flip over. will post a video and logs this afternoon.
This happened a few times for me. It was a leveling issue. This is how I solved it:
First, lay on the throttle slowly until you get a slight liftoff. If one side starts lifting first, kill throttle and got to step 2. Even 2 inches difference should not happen if it is properly leveled (at least in my experience).
Make sure copter is on completely level surface. Instead of holding right-yaw for 4 seconds (as you do to arm), hold it for 15-20 seconds. This will trigger leveling function.
Then arm again, and apply throttle. Increase throttle very very slowly. It should lift off evenly. Again, if it lift unevenly, don't even try to fly.
If this does not work, it might be very uneven power for a variety of reasons, including uncalibrated ESCs (see wiki), incorrect rotation or prop direction (check the airflow, see wiki), loose connection etc.
hope this helps
i thought i have it leveled perfect. i did the leveling on a table at home which is leveled verry good. but will try this afternoon.
i followed your instruction but with no succses copter still try to flip.
i am quite curious to see how you resolve your issue. While waiting for the props (i guess a week or two), i will build a powerful quad and hope to share your experience (or get the same problem). If i can not get arducopter to work, i have a fallback-option, however, arducopter is much nicer...
Are your motors also from RCTimer ?
Same problem.... my current theory is that the propellers are not all in the same plane. leveling was spot on. good luck
Hello Jonny !
Is not having the props in the same plane an issue ? - If i e.g. create a quad-frame with two rectangular tubes on top of each other, they will have a delta in the plane of e.g. 15mm (if 15mm tubing is used).
Is this an issue ? - I find it much more mechanically stable to have e.g. two tubes of 1m instead of cutting pieces of 4x 50cm. - Does anyone know about this ? - This could prevent me from creating the next construction error (currently starting on a quad, as i can not get my octo flying).
I bet it would be okay - i probably should have wrote 'parallel' planes. if one motor was askew by a few degrees i bet that would cause some strange air frame behavior.
@ Michael... thanks for the update, i'll double check my balance. how close to perfect do you have your copter setup now?