RC India

I just completed the build of mini h quad from quadkopters.com.

My quad is just lifting up from the front nd flipping over...Also I m not sure about the PID settiings. woudl really appreciate some help with these settings...

thanks,

First of all, did you calibrated esc and accelerometer ?

yes, i calibrated both.
self level is off. all channels are in proper direction and sub trims are zero.

and please confirm that values of the censors changing while tilting.

yes they are.

the quad has a battery on the back so it is back heavy but it shouldnt matter..

are you sure that the CG of your quad is in center?, pic shows that the battery is in front side so weight is littlebit heavy in front side.

thats the rear of the quad...on the front is the reciever nd camera...

cg is definitely not in the center. it is back heavy, nd no place to move components...

sorry about the front/back, the heavy side should respond slower and light weight side should respond faster thats what i meant.

switch autolevel on may help to balance CG issue. but not recommended because motors in heavier side need to work more to balance.

better to try occupy battery/FC between the plates.

should i increase forward trim to compensate nd then just fly it when it is stable...??

that will increase strain for the motors in heavier side

so wat should i do..??

move the FC to center between top and bottom plates and move battery to center of top plate will give you better CG.

it actually helped a lot.... thanks.
also, it is actually very sensitive, should i reduce stick scaling or change PID??

stick scaling will help to change rx sensitivity,  and optimum PID need for Stability.

You need to balance the Quad for sure before you can attempt to tweak the Pids or the trim the radio to get the mid values on the LCD.

If your quad is CG balanced and the radio trimmed to get the mid values on the LCD Then your Quad will respond accurately to the Changes in PID else you are just multiplying errors as a beginner.

You can definitely Trim, PID tune and Set an CG unbalanced Quad to fly well but as a beginner I would not recommend that for now.

I've moved my batter to the below the quad, the cg is now in the middle...
and i found some very stable settings on a video but i need to reduce stick scaling to reduce quick movements..

in KK2 your stick scaling should be b/w -100 to -90 (min. value) to +90 to +100(max. value) for all channels except throttle.
for throttle, is best left at +90 max.

you can use expo on your channels, to decrease the response near middle stick, and retain the response on stick ends for acro flying.

i broke my props....the new ones will be here in a couple of days.
meanwhile i have one pair 3 blade nd one pair 2 blade props...can i put them together??? anything bad that can happen becoz of this??

NO, that's no recommended.

ok...then i gues i will just wait for new props...

That's better Else you should order more props(may be new frame too)

ok...
also, this is my first multirotor. I've flown a small Hubsan X4, so what should i be cautious about??

You shoul'd be cautios of everything,
Before flight,
1) check prop adapters or prop savers are thight
2) Recheck all motor and receiver connections
3) place the craft in level surface.
4) check response to each channel by giving only 20% throttle (Quad still on the ground)
5) If any controls are inverses , reverse it.If s channel is non responsive, probe it.
6) plan a rough flight path before you fly.

Now give 50 - 60% throttle, until the quad takes off to the air, Now If there is any kind of unwanted drifting, correct it by 1or 2 clicks of trim - until it is stable.
once it is in air, you should take care not to loss orientation.

Also take care to land only in a level surface.

These are the general points to be noted, if I missed anything, pls correct.
Wish you safe landing :thumbsup:

my values r all postive nd very less.
i cant put negative values

Is this for the receiver test? The values need to be between -90 to -100 and 90 to 100 for all channels except throttle (0-90 for throttle). The values will be negative at one extreme of the stick position (except throttle) and positive at the other extreme. You can use end point settings on your Tx for this. Which firmware version do you have? I suggest you update firmware for the best flight performance.

Ok so i checked and these r the default values in the board. the throttle is +90. and the rest of the values r not going below 0.

plz check the images. one pic also contains the version number. it is 1.981.
thanks.

Wow how does your copter behave with those stick scaling settings?

Stick scaling basically sets how reactive your copter is to your stick inputs. Lower values give stable flight, but if its too low, your copter will not be responsive.

Default values are 30 for yaw, 50 for roll/pitch and 90+ for throttle which works allright from 250mm to 600mm quad IMO. I increased them when I wanted to do flips, and now roll/pitch is at 80, yaw at 50 and throttle as it is, on a 250 size quad. Rest of the settings were default!

Also these values change if you are using expo so keep that in mind.

If your quad is still flipping, its probably got to do with
CG, prop & motor setup, frame orientation ,bad piloting skills. OR some component such as motor or esc is having some issue.

i broke my props the day i completed my build. waiting on new ones.

but i m a beginner and i felt that the quad was a bit too responsive. that is y i wanted to reduce stick scaling, it didnt flip as i was being very careful and slow with the inputs.

i will try the default values u posted and post the results.
thank u.

1.9S1 is old firmware. With it my quadcopter was flipping by itself. When I updated to the latest firmware, now 1.19S1 the problem was solved.

ok, then i just ordered the programmer and i will update the firmware.

but i will try to fly it once i get the props...lets see if it works...

I have never heard of 1.9s1 firmware causing flips. It would have something to do with the setup or settings.
Never had my quad flip on me.

As for the OP, it takes time to learn to fly. And taking off, flying without changing orientation is not actual flying in my opinion. You should be comfortable in all orientations in acro. Order extra sets of props and keep flying :)  If you still have the small quad, practice on it. Wish I had done that.

I bought a small hubsan x4 an year ago. I can fly that very easily in high rate mode too.

I m hoping the props will be delivered today nd i cant wait to fly. I m hoping the results wont be completely disastrous.
Thanks.

So, after using relatively low stick scale settings, i can fly my quad with ease. it feels good.
there is only one thing, i am flying in self level mode and the quad is very slow in responding to the rudder input. wat should i change to fix this???