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Just come back from test flight and it works perfectly now! What I have done: 1. Turn off Lipo protection under assistant. 2. Compass calibration. Now ...I need to turn on the Lipo protection again and see if it makes any different! Thanks DLien for your help! Anyone can tell me how often...

This is part I of the setup so far...flight test will follow: http://www.youtube.com/watch?v=AZKJ_PIfpPw Many thanks everyone..

Thanks DLien. I will try that later...for vertical gain..I try 100% all the way up to 250% already. I will try disable the Lipo protection feature ( just to see if this makes any difference ) Activate a throttle hold at 50% flat to test the hovering ( this is just to make sure I have throttle...

I did fly it until I got the battery warning - red flashing light show up. Dont see anything different in handling ....

Yes...everything is linear only...thanks MRK

This is my Lipo setting here: Will try to turn it off and see it make any different...

I have gain set from 100% - 250% using a VR switch but no luck...The video you see here is running around 120%. I do notice at high setting ( over 200% ) I can see some oscillation of up and down - motors are rev up and down...

OK..I will try to turn off Lipo protection and give it a try!

Yes..I did have RC helicopter and airplane experience, so I can tell I know what I am doing here. I bought the unit as a complete build by dealer, all I suppose to do here is to install my radio ( I fly Mode I - Asia style which I dont see this can be a problem ) This is why he told me he test...

One thing I notice, when I first setup the F550, I did pick the S-bus. For fail safe setup, (I turn Tx off ), assistant will go to Fail safe by itself. However, when I switch to traditional wiring , I do need to set the 3 way switch fail safe position in order for system to go to fail safe...

Thanks, I been looking everywhere if I can find what was wrong on my side. Talked to the dealer and he mentioned he sold hundreds and have not had a single bad one! Just wanna to make sure is not something stupid I did before ship it back to him. In fact, he tested the unit before he shipped...

BTW...show you the F550 with top plate on. I have X: -7cm Y:0 Z: -9cm Does this sounds ok to you as well...GPS behind the CG.

I dont really see the hole but my setup is clean. Attached the picture for your reference.

I have problem to make it in calibration mode. Did it once but I try to do it again after I switch GPS to M 10 times quick...still not going there. Plus I have heigh holding problem...show below my video http://www.youtube.com/watch?v=Ck57b1l_PK8&list=HL1342650622&feature=mh_lolz...

Thanks Boriss for your reply. I did try to fly under ATTI and GPS mode - which both has same problem of holding heigh. Since I use the Fubaba Radio, I also tried both the traditional and D-bus wiring as well - turns out same. Under assistant - throttle channel works without any jitters just...

Yes..I am 100% sure it is in GPS with green light confirm. Vertical gain I use VR switch from 100 - 250% . I have 10 flights so far and just no way I can hold it fix height. I try to recalibrate but it wont go to calibration mode...any idea.

I did calibrate the GPS once. However, I try to do it again, I just can't to get it to the calibration mode ( I switch GPS - M mode back and fore 10 times...just wont go to calibration mode, anyone know why ? ) I am using 3S pack and try both 10" and 8" prop - Both behave almost same! Just...

Me too...I need help on my Naza controller which I can't get it hold height. http://www.youtube.com/watch?v=btRTuj_7l4Q It was done in GPS mode. Throttle at 50%, it just wont stay fix height.... Any idea ?

I just got the F550 with Naza controller with GPS and it won't able to hold height - but pitch , roll and yaw works really well. I have try different vertical gain value from 100 to 250% with not much help. Sometime, even at 50% throttle, it can still climb and I lower the throttle, it still...