Naze32 problem with terrible yawing left.

M

mark knott

Member
I built an ImmersionRC Vortex with parts from my Emax 250 Quad.
Vortex crash kit 1 and 2
Carbon fibre bottom plate with no electronics.
Naze32 Acroflight
4 off DYS BLHeli 20 amp speedies
Emax MT2204 2300kv Motors
2 mini buck converters set to 6 volt for receiver and Naze32. The other set to 12 volt
for FPV TX
Boscam TS353 TX with Aomway 4 leaf clover Antennas
DC12V 1/3 960H CCD 700TVL 2.8mm Lens Wide Angle 32mm x 32mm board Camera.
Multistar 3s 1400mah 40-80c packs and Kypom 4s 1400mah 65c packs.

I have a really bad yawing to the left problem. Its worse when i throttle up and goes into a spin. Strange thing is that it only happens with 3s packs. When i use 4s packs. It doesn't happen at all. Anyone have any ideas what is causing this?

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holtneil

holtneil

Well-Known Member
Moderator
Hi may just be lack of volts when running everything 3 cell 11.1/ 4 cell 14.8 its trying to run all the FPV system and the quad try a 3 cell on just the quad no fpv and see what happens , The motors are a 3 cell rated motor so if you set up and tuned on a 4 cell your set up may not be correct for the 3 cell
 
M

mark knott

Member
I will check that. I cant remember whether i used a 3 or 4 cell pack when i did the Naze setup. Maybe that is the issue. I did have a PDB fitted underneath the Naze that had dual 5volt/12volt outputs. The 12 volt output gave out after a few flights. I was getting brownouts on the Receiver so i switched it out for the buck converters. I wonder if the buck converters are drawing too much from the 3s Lipo.
 
Jackson

Jackson

USA member at large
mark knott said:
I was getting brownouts on the Receiver
Click to expand...
I don't think higher voltage is the answer, I'd venture the overwhelming bulk of the installs in the field are 5V. Many brownout problems often seemed to be caused by low amp ESC BECs. Maybe a decent 3A 5V UBEC would have been a better option.
 
M

mark knott

Member
Jackson said:
I don't think higher voltage is the answer, I'd venture the overwhelming bulk of the installs in the field are 5V. Many brownout problems often seemed to be caused by low amp ESC BECs. Maybe a decent 3A 5V UBEC would have been a better option.
Click to expand...

I think you are right. I think the Buck Converter is not giving a stable flow of current. They do state that they are 3amp rated but i have my doubts. The problem with the pdb, was that it was only giving 4.75 volts to the Receiver and Naze. As the Lipos drained down this voltage obviously dropped even further which caused the brownout. It was a costly crash aswell. Antenna mount broke off my Boscam TX. Damaged a motor and ripped the Antenna wire from my receiver. Lesson to be learned. Dont buy cheapo Chinese PDB's.
The buck converter is fine for the Boscam TX but as there is no capacitor on the output. I believe the output fluctuates. The Naze needs a stable flow so a Ubec with a capacitor is most likely the way to go. Just got to find one small enough to fit inside the Quad. Space is very limited.
 
M

mark knott

Member
I think i may have found the problem. I did try a 3amp ubec but it did not make a difference.
I was checking the solder connections and i noticed that one of the speed controllers is different. I originally had 4 DYS 20amp blheli speedies. One of them was faulty and the supplier sent a replacement. However,They sent an DYS SN20 speed controller. I think these are Simon K and not blheli. I never noticed it before.
Could this be the cause?
 
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