F550 Problems

fblonk

Member
Hello,


I am new to the hobby. I purchased a small house drone and flew it for a few months, then manned up and ordered the following and built an F450:

4 Sunnysky Angel A2212 Kv980 motors
Carbon Fiber 1045 props (balanced)
4 Hobbyking 30 amp SimonK esc
DJI flame wheel f450 frame
NAZA V2 w/ GPS
Spektrum AR8000 Receiver with Telemetry receiver
2 Turnigy 5200 mha 10C Batteries

I had watched around 60 hours of you tube videos and after a learning curve it worked. Had a blast. Flew it for around 2 months. It flew great, with no problems. very controllable and I was comfortable with it. While flying a prop broke and it fell from the sky. I repaired it and again, it flew great. I decided that I wanted to go to a hex copter so a single motor failure would not be as catastrophic. I ordered generic f550 powerboard and top plate, more Sunnysky Angel motors, generic arms, and more hobbyking 30 amp esc's. The motors that arrived were slightly different, the prop shaft mount is 1 mm off the moror where the others sit flush with the top. I installed everything and again after a learning curve I got it to fly, sort of. I have changed the naza software to hex copter, calibrated the esc's individually, the mr is balanced (if held by a string I have it almost perfect AUW), all wiring is correct (checked 4 times), gps puck is measured correctly (learned on the first quad), solder joints are fine, all looks great but she is extremely erratic. Here is my dilemma:


On take off, it drifts to the right uncontrollably.

The throttle after start does nothing until I hit 50%, then is responsive only above 50% (I have calibrated the ecs's 3 times. individually they respond full range)

The gains for pitch and roll if below 270 causes loss of control and crash, currently set at 290. I know this is way too high.


I am at a loss. It has been sitting in my office collecting dust and it is killing me. I want to get this to fly again. Any assistance is GREATLY appreciated. I can provide any info needed. Sorry this is so long.


Thanks
 

Motopreserve

Drone Enthusiast
Sorry you're having such trouble with the 550.

First, the throttle is reacting correctly if you are currently flying in ATTI or GPS mode. The 50% throttle will be the "auto" liftoff where it pops up off the ground and then hovers at a set height (usually a couple meters off the ground). In these modes, 50% throttle is acting as auto-hover and holding an altitude. At this point, the throttle acts as increase or decrease for the current altitude.

The drifting you're experiencing could be caused by the GPS puck being skewed in one direction or another. The arrow should be pointing either straight, or more likely slightly askew to compensate for your location on the earth (magnetic declination).

Lastly, the new motors you got that are slightly different: this may be causing the Naza to have to fight against the other motors. Are you sure they are the same Kv? If they are different heights, that would cause issues. Do they start at the same time when you power up?

Also, are you sure the ESCs have been flashed with the same firmware?
 

fblonk

Member
Thank you for the reply!

I researched the throttle issue, and you are correct. It is functioning as it is supposed to.

I had the puck straight on the F450, but did adjust for magnetic declination on the F550 build. I have since put it back to straight on. I live in Florida on the gulf coast and the declination is only -5 degrees.

The motors were supposed to be identical. They are the same Angle 980kv from sunnysky, but the paint is a shade off, and the propeller mounts are different. This could be part of the problem. I am considering changing all 6 out for new ones purchased from a single vendor, but this seems like a waste of good motors. They all spin up at the same time. I may go back to my original vendor and purchase a few from them so they all are matched exactly.

You bring up a great point on the ESC firmware. I will research this and post when I find the versions. They should be all the same, but I have been fighting this for 2 months, so I will double check.
 

Motopreserve

Drone Enthusiast
It's hard to know which firmware version is on the ESCs unless you flash them yourself to be sure.

If for instance they have SimonK pre-flashed, a newer version may have been released and put on the newer ESCs in the time since you purchased the original ones. Unfortunately, in my experience vendors have been very little help in this area.
 

fblonk

Member
I have ordered the USB flash drive and connector that goes directly on the processor to flash firmware. I also ordered new motors That should be identical to the first ones. I will post back when I finish the firmware install and new motor install. Thank you for your help.

Sent from my SM-N900T using Tapatalk
 


fblonk

Member
I have purchased the usb for flashing. Installed it, no problem. I am using hobby power esc's (30 amp). I cut the heat sink off one and flashed it with the latest firmware simon k from 4/19/15 and it succeeded. My question is this: I am not 100 % sure that I did the right thing. I counted 32 legs on the processor and the pins from the flash tool that goes on the chip lined up and the flash went great. Before I flash the ones that are mounted on the hex I want to know if there is any way to check the firmware installed on them now before the flash so I know that I am loading the correct firmware on the esc's. Is there any way to find out what is on them before I proceed?
Thank you again!
 

Motopreserve

Drone Enthusiast
I don't know of any way to read the current (or newly flashed) firmware on the esc.

The flashing tool typically has a red dot on it that should line up with a dot on the chip. I believe if you had it wrong the esc would probably be trashed. So you should be good :)
 

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