Nice one Oscar! That clump of trees doesn't look as threatening with so few leaves, not such hard lighting contrasts as when you fly under that canopy in summer.

How did you find the Kopis to tune? Did it need hours of fiddling or just a few adjustments?

(14-Nov-2017, 04:18 AM)Tom BD Bad Wrote: Nice one Oscar! That clump of trees doesn't look as threatening with so few leaves, not such hard lighting contrasts as when you fly under that canopy in summer.

How did you find the Kopis to tune? Did it need hours of fiddling or just a few adjustments?

Thanks
Like tuning any quads these days I only fly it and adjust my rates a couple of times, then my PID a couple of times... and that should only take 10/15 minutes.. These things fly so well out of the box, tuning is a lot more simple than it used to.

I don't really look at Blackbox that often unless there is an oscillation or something and I need to adjust the filters.. that would take hours to do LOL

I always like watching your flying Oscar. You have a distinct style, very flowy.

I am good on rates but with pids, do you have a specific direction that you go with things? like anything that you can guess before even flying... for example "I usually have to increase P on roll and pitch but stay with defaults on yaw" (which I use because it's sort of what I go with today myself)

Haha when you regret that you disarmed... i know that feeling.

(14-Nov-2017, 03:46 PM)Carl.Vegas Wrote: I always like watching your flying Oscar. You have a distinct style, very flowy.

I am good on rates but with pids, do you have a specific direction that you go with things? like anything that you can guess before even flying... for example "I usually have to increase P on roll and pitch but stay with defaults on yaw" (which I use because it's sort of what I go with today myself)

Thanks Carl


It's really hard to describe PID tuning in a few words... but FC software works so well these days it's mostly not required anymore... unless you know what you are after and you know what you are doing... anyway the best way to find out is to play around with the values... change one value at a time and see how it performs...

For the Kopis, here is what I did...

Firstly, there are certain things you can kind of guess before even flying the quad, for example, the frame design, and the weight distribution etc...
 
Stock PID in Betaflight is a really good starting point, but that's based on normal X frames where left to right is longer than front to rear, and pitch axis is heavier with all the weights of HD camera and battery etc.. 

when it comes to the Kopis it has a stretched X, roll becomes easier and quicker for the quad compared to pitch, so the first thing I did was to lower roll P to reduce its sensitivity, and lower D as well because P is now lowered, and increase I so the attitude is more stable...

Now do some rolls, flips and back turns to see how it performs... and adjust the them again... 
I recommend going through my article about PID tuning if you need more info  

Go to section "my simple tuning processing"
https://oscarliang.com/quadcopter-pid-explained-tuning/

(except you don't always have to start low... you can start from default value)


For yaw, yea just use default unless there is something wrong with your yaw performance...

Thanks this answer helps give me some extra perspective. I understand the PID system somewhat (bruce's video on it was awesome!). for those of us who came into the hobby in 2017, adjusting PIDs often means that things get worse rather than better. We haven't been around for the times where proper PID tuning was required to get to locked in flight. The insight that I needed came from this line:

(14-Nov-2017, 08:43 PM)Oscar Wrote: when it comes to the Kopis it has a stretched X, roll becomes easier and quicker for the quad compared to pitch

This explains a ton for me, although I doubt I could articulate to someone else yet. I'll need to play with it a bit. So thanks for the help as always!